Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d7912894f57302…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 07:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54948a8aa7019b0e172221a6f5ce2e86 SHA-1: 7f50847114fe15ea625993a672436094b18805d6 SHA-256: c1d7912894f57302e85e8997a7ba333dc9861d3cf931c04a0a072338cbee4352
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b786698c139---gubixulodozufag.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qvtgg78219pbg5nnkdsbt0v6mg/53784773275.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dadan.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/11188361058.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611154166f4bf---91499670598.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/355940cfb5e93749aab984f5a93d4c8a/lekixerivojumulemopemit.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/puvunotetirepizodifava.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uks2q2gojhhroc9621tpoqt4pu/telesuvili.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2de710aad43fb2440ca8029981ba5b3a/31844734872.pdfIn PDF document text
    • http://poultech.net/d/files/jogatisefixiredopuwuwit.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160727a0e17b54---10809353907.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/9983294270.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gawijawuguxijutegugawaju.pdfIn PDF document text
    • http://didula.com/img/file/86516698972.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/18058970405.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/gomemiliwi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7d7d9789b978e78952b073ccbd1e6df6/bunowemur.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/larawevuji.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/zuvifanefizu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/30799432702.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d022b5c15b4124d7f22c8f371716c628/73059010500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=beta+distribution+examples+and+solutions+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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 11052 bytes
SHA-256: 9604405e278519324569c81bf31a60ff176c9f370ec713213f98c8f23d39f8c1
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 18308 bytes
SHA-256: 9e0a5eb89f9e70a5b4f2c07cc262f53bbdfb1c7280a806862e9564251c607ae7

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