Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5d14a021f97020…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 11:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c4819ff6c92b9b4477d9d6e075135ef SHA-1: 688ce281e770a9e1fec59b9d11c2b8522f352172 SHA-256: 3f5d14a021f970202a89a3782b084936594ac40df2d3d9d126cde1dc7ed2605f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arab-hams.com/Ups/files/7129119606.pdf In PDF document text
    • http://dentalcenterstudio.it/userfiles/files/99198980766.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/betamoja.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/fesunotanavudetulipeze.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/duxumalevaxisowa.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/58087199471.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wuxolu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/14226328868.pdfIn PDF document text
    • http://deauville.ru/files/file/doxumofagufojegugit.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/kepitu.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/91334980711.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/858606391.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xovolozemor.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/tojidinamuruma.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/63400514611.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f01dcba3c---lodidipam.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7cc398c5---zobekomaxowibujagozax.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/23995049786.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/86141412408.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sidurivakisomaxurewujepu.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/58738809326.pdfIn PDF document text
    • http://grupophi.es/uploads/files/69561625417.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/sesulabidati.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b4u3l6q2usfoa2ri0leps6c8bo/8159144963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+change+my+app+icon+on+androidPDF 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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 10840 bytes
SHA-256: 006a8742e0d77e850dd61d4c9447418abb97d6c7f9725f45121a59980f575a65
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 17036 bytes
SHA-256: 96c60501dbb5653b86c367b6f0fc2ef6ac5c73aa7c1fb611cd022b477bcd6cd1
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1