Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb649dd8bc47e5ca…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 03:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4120f4bb623c9b0f0a742fa7f0a6c93 SHA-1: acad0959b1d8f9251710f9e3403aa9290bf3c00a SHA-256: bb649dd8bc47e5caa58d8a573d3583daaa992dc48cdf810a057307e3c8e3a409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=acculturation+scale+pdf PDF link annotation
    • http://contrast.no/ckfinder/userfiles/files/80350398947.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad2d6276a---20446954833.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/84697722143.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/19858407253.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/manabo.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/5734423710.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210708010628.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/98592412844.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/72129232045.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f84fa74ea---4791902183.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gupuxego.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lk61n3spedr0c0erjbia4t3n73/balakoletipimifide.pdfIn PDF document text
    • http://ore-processing.ru/d/files/75510592899.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ql7sc94b3horffpit6vodomlle/34517926290.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080111191831.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/77190934856.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mj13fp2jb1dcqtj31qopfuo8a5/18316746911.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9c661da2---gutovapuzekowibamubafat.pdfIn PDF document text
    • https://agatanorek.com/files/file/73523544795.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/44624070815.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a240e8b1634ac796b35ac274c553bbb0/semevajabip.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/bopukeza.pdfIn PDF document text
    • https://ottopianos.nl/files/27468543918.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/33636431626.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/31918694274.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3a17b3e0---80634531267.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 17992 bytes
SHA-256: 98f18965ff4b43b4cb8e0fd86d8ca2e9c66a08eb266096635be4477e40539b29
font_01_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 10692 bytes
SHA-256: 5504b6b885f8d6c19d803c0264aef1cb2f0b0827f1dac27f65052409aa17431e
font_02_sfnt_off0001328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1