Malicious PDF — malware analysis report

Static analysis result for SHA-256 729cb5eebe5558b0…

MALICIOUS

PDF

154.0 KB Created: 2021-06-27 07:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 792541f1c47e818568286b0e7de57ed5 SHA-1: 2e10c80b24390e191b665e7e17e916a57aaeda00 SHA-256: 729cb5eebe5558b04ac65db3f7e522186a4b4b1fa6eb00e8a45e7edf594f54db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of using compromised CMS uploads and link farms for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=handbook+of+meat+and+meat+processing+pdf PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad1c234350---sofapegijozetixosemidotax.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/30331812956.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b2107c0d265efa2f9486301ebe0ffcc2/92613818384.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5d18a0656c3ad9a6c0f9cdc9f6905200/66246847322.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d758491e---33824074499.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c31c6d238fbfa7eb68a4e6e75b21efc6/kafusirenamoki.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e512a1973c---35602057257.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/sojoxixekisodoxudusemij.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b692c65c64aa2586447042c79e921b3b/memukuvibopalapumiluwow.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae54c661fc---ruzof.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/83cc25433e720c0c42e88161a0112805/superesitilazi.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/wifasagaf.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/12790873827.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4nas74v650htiumng95f6nmvl0/75809489829.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/robizozotewipetonok.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/429f8b05ac750266031fbe8ba70c439b/xuwupid.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e4cf581b3a249fde6944d2f80c2da53d/26582644210.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/72519472469.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/kiwudatowulone.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607555275e6d9---53775550222.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_off0001f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F348 11140 bytes
SHA-256: e2794bb79a959667170af981b0e20ec3ef2d7a0408003c77702302f9d6d3ef10
font_01_sfnt_off00020cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CD0 21180 bytes
SHA-256: bed9bdeadb1e7aa006ca6c881e8fd7c39f665db0eb1bb807f8a8e433766f12d6
font_02_sfnt_off0002422e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2422E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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