Malicious PDF — malware analysis report

Static analysis result for SHA-256 2512387f4816767d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-13 12:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71aad7302a8be046f9e3164c754f6719 SHA-1: cd41e6b9b9a52a45b5845864afb9de56e6456eb5 SHA-256: 2512387f4816767d7257f1d96f6383f8ea430c0eeb00ac686cb4e051b82e4a70
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or exploits, suggesting an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b84dd7f9---naweralowuwikazukoruvinen.pdf In PDF document text
    • https://quaint-house.com/46387535612.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/58644806028.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/46773927930.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1121602e2a---49599001328.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b101b84ec6f---lekaganojugibaxokas.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gsv70cb0nh93gddklevc7l9dqf/luduzadumafetulureza.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/4362072579.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df53fb4e---puduwawebego.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3dcd0fc05---zuxalaranorujiboval.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5f6c0040b78426383bf3ceeec4251481/64927908519.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd4d935f0---vojewadosemu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/semelofefigasaperej.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fanemazetixozimasotelufo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2244i0thd7d67r34vmpm3h2hke/nekesujesupesowo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adfa1e5c4---90696140317.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210613134659.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ab9d7b78---81807977769.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa30587ad4---76125083078.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/5112060506.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0e292a6e---5858506170.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/93fb8843d6e570188a905c9eddc50a17/kerisotokusomuwexi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607606c2a9a9a---rutidiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=seedfolks+sae+young+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10764 bytes
SHA-256: 9e97b829e56aa42f13cf67f524dfa2abce0424944f4d01c88e2ab2eeaa32ad99
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 17236 bytes
SHA-256: 483e9d67778991e4a345173b62f938f10f8e57918ddfd8dfd44cda1e28cfac5a
font_02_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1