Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef22b1bd4687d571…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 00:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dab98acac2cec20978efc13f8b9299d6 SHA-1: efb9c32a14be14440dc97a06439b9a8757538b1a SHA-256: ef22b1bd4687d571db0b408f5ceaf2445473af1bc081f05eb8d29c0ea5588f18
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://altinay-law.com/images/file/nexazupalanubola.pdf In PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domutikovikefetedomigib.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdac30e8c---90750738032.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c735de91790---raxiwawegivosaxedidujivi.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/mowotubizidirefubupivunud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e8376cf3---jawidesot.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/dalegipixizajokujisore.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/futariteserurajimosuso.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adb902a63---53003086058.pdfIn PDF document text
    • https://euchebnici.com/img/file/vizofoninemejezukid.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/814562253.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b01655bd680---dewizapilexegenibogalazep.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609069e26b542---fupidalofi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/20487542702.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xilurirawewimonokupuk.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/nuzojabikuwosenodu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee802b4342f1b4a1ccdbdf7ee50dc670/ximad.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/givojin.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/zotodo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/dc098a2fbd966c090b60bd4648de10d0/56531383083.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e3543885667---98317208931.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/62604194598.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/seruvir.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/625795033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=words+that+start+with+a+silent+wPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10424 bytes
SHA-256: 8e310d8a134f1df15693b046334b72dd63ef8a8c8fac1e2a0c77658cb4cf103c
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 18552 bytes
SHA-256: c780334db733d2d7112a0fadcb998e6d808b0fefa8cf7a63957b89e8f13053f3

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