Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c5b4c2b348a0f1…

MALICIOUS

PDF

92.6 KB Created: 2021-08-03 14:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: bf48d441788a00655bab945b39b5cac8 SHA-1: f755dd93203ed1f39eeaf6681e01c00c8806c5fb SHA-256: 22c5b4c2b348a0f191decbe1275f6e769f1b9de210dd34079f1ec87e14c671fa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e717d43a---35457062795.pdf In PDF document text
    • http://smartpaintingplus.com/userfiles/files/14989193926.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/o61o98h6tvu1thlf582n56lepf/41207223373.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dc8fce8d84758a2d76fb53850ac921bd/sapefebu.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/59771635137.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffc83511f---3516594007.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/51244647368.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abcbe892a6c---1723790575.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092edcebdb6e---86930576401.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c2d46d8ca74781a1929971bb327d7ba/biberegulirigubegobibi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/42236217242.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92408226ed---79195351551.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed0cf12c4---veropura.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a54ec8c67---56290466306.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b76cb04e---76988625412.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/073768c3abec8c20296515681e123a8b/33997370185.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/tonem.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca7f1da25---zigisejipomipanizasevuji.pdfIn PDF document text
    • https://rcot.org/userfiles/file/13257898449.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/28842601994.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb33682888---poxotag.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/madefiwinuwatoninemakunep.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/38964235075.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5956947a0d4c9c93f5e6fc0f3e1f2867/72900129707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=morrowind+crack+frPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ff03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF03 17492 bytes
SHA-256: 61b38a0f1425e170c41c6c2237164d227be380a73805ba83c5b76a5382ff733a
font_00_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10196 bytes
SHA-256: 6d2c49df64c921cbbb1de247c5356ad6738b73046de70d358e2a756a6349fdcf
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 19588 bytes
SHA-256: 614139248af63202a3479019edec6ffda5e5651137a9c64a5095718ee62e6523

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