Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a8a9872d5211c5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 03:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 833694df040a9e3ed0ca28a9af90ec72 SHA-1: a2caca5f17470382f5eabcfbb5166f22cf796394 SHA-256: 80a8a9872d5211c5a88e84765bd6045388664dcd9616909b118f9f1fa250f752
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, likely designed to redirect users to phishing sites or download further malware. The presence of compromised CMS upload links and disposable hosting further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=gout+pathophysiology+pdf PDF link annotation
    • http://pjzhengwang.com/upload/file/20210903_044417_132.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e654c86b870d786023996fee19ba43fb/sajibutumunakamawixa.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd502frquv3c21s4punt43nsgv/noxopiguxaxafele.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/86893167408.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/659351203.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/24185834811.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wevijalexu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7299973844.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/292312594484.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/93805442090.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ca99fccc---fidesoga.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076190e0476f---sevojuxokeriri.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaba0a9751---89231365174.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb85c8501---tenapamularirowi.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/36521029947.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/829967d066939d788694fc838932c62d/radiremunana.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160755b1eb0f58---zajet.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/98899661684.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/mabibo.pdfIn PDF document text
    • http://teakdeck.pl/files/file/divemafovojijimokadadi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb18c35cf5---30698169987.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/g1j5pf81t3n4r1g40bfhb65m3p/doruvugojotoxabibakis.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/438070ca2cc9d918e393bbad727c87a1/lonenobizomu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/45cfed7a3708ba4f3feea016973f82d6/80398074551.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/72283699945.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jumubisexopigef.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10696 bytes
SHA-256: 94bde27dd65df4693ba587ad4c3b19d913609a60825d5d2b0ba94f400a393a0a
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 17640 bytes
SHA-256: a9d762e95095a301220d8a4618b7f9c827fd308bc23b9dbd4ad767ede9be38ba
font_02_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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