Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c042611bf322b0…

MALICIOUS

PDF

81.9 KB Created: 2021-06-14 06:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 42ac4aa7954f9471e7e2fa65af603427 SHA-1: 3723093ae8b32099e0eb97c09365c82d1b64a2d5 SHA-256: f4c042611bf322b0609536c57d791b46648e0df1e30f3c94cd0b2e39a1842693
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. Although no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=area+converter+hectare+to+bigha PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6e5175d5a17e3b2cfc05fbbc08078592/14558080689.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a41a8d8bf---79941000322.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffc3e1f1---wasozeguviwokefatatupine.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906c6ac2a2e---fajine.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rj2ejiofngtdll2413ll3b6icq/kamolarokavixazunilos.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c686700d9fa---fefilasasotezenexunano.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4a987d0b---wokapixiwarosuk.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/78f04e6d820b61de7cc0e2d077232cc0/4119913081.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/wegisemibuzipotirajisojan.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/54943930261.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/88002055756.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/40117968647.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jmri1v029ab87c9eadsftg6rm6/mavut.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6c744650---4655901993.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2065b1745ffd48f1f4068bde8e504e93/16174478907.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file/%5C/tutalibuxipelaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 5040 bytes
SHA-256: 9a6bcb321fcc291797a768c3edb98db7a9c2f23c76f5cd3a22d2567961233290
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 4728 bytes
SHA-256: ef63ad151b7b4fe0750487d520d646051980d2ae0a44bcb2fdb01011d6ea8e9d
font_02_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11020 bytes
SHA-256: 0612d72cac013b43135b77bd3f717a488f4ba336f32532ab203bce91d4fb351a
font_03_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 5064 bytes
SHA-256: 9d2d5ecc014b69e4c8518f0192fefd349bf1f1ef053a4c4d481925458a0c5d6b

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