Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd7c0520b211255…

MALICIOUS

PDF

100.2 KB Created: 2021-07-02 10:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 137b36ccdeff03f8aa0710d167e9b290 SHA-1: a22dae5d222577088eae28e7d39df9fe0ba62a11 SHA-256: 5bd7c0520b21125563259d0beba760eb8bdf5687f67b42b2d1f47e65cb24dd51
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d22e7e8c172c1cf686ec715d66d5699e/dupolavomowu.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e438450b---puwewo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/ravasomiziluvataki.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fc1eda8e403628642c38a378fe4dbd84/86004364584.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/477668ef94d92a56765ba284d7a6bf10/34777421125.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/debefabumotunuvat.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/vudofotetawosike.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/709d99o4jjb3c2r3dhgtiorrr3/meresudubud.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a310056231d---rifigigowo.pdfIn PDF document text
    • https://cooperspick.com/files/loralamukovokogewaviwale.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/81264929287.pdfIn PDF document text
    • http://yejida.com/userfiles/file/kerun.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6d4ehtqmip9skvl0oigqe4bghr/sutaropovarixivulaxowupaf.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/raup5kc5ots54tbqh2bs20hq92/sagulafevox.pdfIn PDF document text
    • http://newo.ru/files/files/bulemogo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/35427327430.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5116d6a15---58570365021.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2682e026---99865945317.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/zulewoxizebagolofuzo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff5529bff---8285451534.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e7968f114---73446123268.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8a6b0334---1847526667.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51165177460ecae0f65ac0c301866ec8/simezokariji.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65846cab21---20742291604.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mhqeptg2etvc36hqlvrlf5kcjs/nixokunuzivatumixagud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=accretion+in+a+sentencePDF 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_003_off000112fc.bin
d23b273b64bd1296da61ed51c294e2a714299ddf85b18ebfb94fedd92ffbbe6d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112FC 21156 bytes
font_00_sfnt_off0000fc19.bin
55cb2090abc6d157f6609be393407fe332d64fce94e3cb02b0fcfbb205d63b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 10160 bytes
font_02_sfnt_off00013723.bin
7acd5d763be6d914869e37ed9156b0fef7094185ef0696261994dfa5af6ee532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 18952 bytes
font_03_sfnt_off00016917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16917 16792 bytes

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