Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bfb9364f7a2f20…

MALICIOUS

PDF

98.2 KB Created: 2021-07-04 23:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4261873cd5307e3dd85c47123e51a51 SHA-1: d95a58ec39c2cd231e54f7e1310fd52e67aaab34 SHA-256: d2bfb9364f7a2f2006603a59dc160ddde31cda19b8feb43f390c07bf317efde4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://irlanc.ru/uplcv?utm_term=chi+square+goodness+of+fit+test+example PDF link annotation
    • https://angelsstaff.com/uploads/file/56243908992.pdfIn PDF document text
    • https://biocoils.com/img/file/97676723942.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vavumozukitifot.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fcf46245d5c58ddbd48ed3ceec28502d/buzareluzigetoxuvefule.pdfIn PDF document text
    • http://kag.fr/userfiles/file/98582254132.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/76417346914.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/41be66a9b5d8b490dbbd92882bb2891d/11243325880.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c917d13f---tusikigisixitowirevetajup.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6kjp2e651hcn2sqns9utm8j8u2/nopemabapowuxase.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/tomivosiso.pdfIn PDF document text
    • https://successalpha.team/upload/files/77523309437.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/9085725857.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0a75ae25---54690105510.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/53b456d0658a10c2be6573517d0ee7ec/97149446802.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/10868880598.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ah1de59nkgrpnke9cjucji10dk/13836257916.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/elogh4o28j9sp9bjvvo477i3r5/dipovozibesupibenugeripim.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c744993398---lobuwusogojemilos.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/72072888457.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/61917760750.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/81716958869.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ce0e1c1a---52850632531.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3bd50588682a28812564a7583d16104d/31625517730.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/xuxifuroveremafokisuxo.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_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 19244 bytes
SHA-256: ee189716bb2bfbb6a0ebde652c5f4584330bbc487a38dffb1ce36f549c41be53
font_01_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off000146f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F4 11324 bytes
SHA-256: 78d0422890f6d6e9a1674bdd8453fa6cd96c12f418840b86483a74826cc526c3
font_03_sfnt_off000160e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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