Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96a1cf056278297…

MALICIOUS

PDF

72.8 KB Created: 2021-10-03 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: aa561d1a791b00f82fa26e6bf736e510 SHA-1: dc65b312fe2ea30175f82a3f7191b059e69446d4 SHA-256: a96a1cf0562782979f1c676d526785d6b9153357d519c962763510116347f429
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggest the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a collection of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=promissory+note+for+late+submission+of+requirements PDF link annotation
    • https://geloracinta.com/contents/files/1360627120.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/87074455905.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b5a0870addca517a278569ce4e683c94/32150337964.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7ed87a204c194e88adaa8c4b521fe796/vemigasononotevaweboje.pdfIn PDF document text
    • http://partnercable.com/files/nadalapudazodisonolepa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jn4bsjitnsd4v1a887mf2jsjcq/40579846972.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158cf5c43054---76697464648.pdfIn PDF document text
    • http://przybyszewski.org/image/file/58835499622.pdfIn PDF document text
    • https://asi-filter.pl/files/file/32499041612.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/zesos.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615406cab2f6f---gemadewepedewow.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/19083834209.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/jifiroxofepaxiwo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/44901568604.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/32075018919.pdfIn PDF document text
    • http://proart.by/media/file/8348088549.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/dufenorijuxolaf.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/70993314802.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/82778750039.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dc3f77b844a0bffbb49254908d7027f0/45768326957.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/tavevetow.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/83965177130.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/89630449598.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/podut.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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 18772 bytes
SHA-256: ebff13d8e78acce400b92fc4df53ccf028f67ab67b502e492d2b8d5bb20e43ba
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10876 bytes
SHA-256: bf77ba1c0c55ca684cefbe16c8f8c77befa28c316d52da2dfbb1b8ab859fe0e0

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