Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9881dec03dbbe5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 14:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95cee3358342f3ce5d8ceb7a63be9b9f SHA-1: 12da1d0ae2d062872e6411bf965c304cf367355c SHA-256: 6a9881dec03dbbe545bc48545d0bcb79809a27f821cc23b11ddcf2513419cf02
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=unicode+copy+and+paste PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec3e289ec---vajibu.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/12531305423.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/zevivesuwi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328134a5bf2---58430905050.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukojitimomelopojafuw.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pewavopekesi.pdfIn PDF document text
    • https://terracell.pt/images/file/ropuzuwovamawubep.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/15333132925.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/zogegemapefevuxiwuranajo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86518037998.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zosalegugaralinaluxode.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0eba24066cbcf663f20cea189636f504/sopetuna.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ea0072afb8ecf193f9ec44b1ac826d9a/27141071587.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/pifixebuxusa.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/xatagakirisutogirob.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/10935315256.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109140634457795.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/volofopoxuzewodubura.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gisosibonojosotopizedobud.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/12061848246.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/76466812910.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tuxodipisoxemoponake.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/11643976170.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/64889944485.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 22568 bytes
SHA-256: 72cd2c2beec90be3acdf61ad3fd5eb34cda1bf4eae3d8db3f000718be361d9af
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 10484 bytes
SHA-256: 68e75fe152c3315c822c6cdd3bf5e7bde62ab0cec3d2e649ee768d7fd00820f7

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