Malicious PDF — malware analysis report

Static analysis result for SHA-256 677f2e5f3702cbcb…

MALICIOUS

PDF

87.7 KB Created: 2021-08-30 14:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f81ed46473bcb309f8d7b3aeff1668ab SHA-1: d6d9a44b0fe9496e86ae27777706bceab5a45abc SHA-256: 677f2e5f3702cbcbef70d879b88f6e76288fecea1b89d73499eeedc029b9d306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://atvatextile.com/upload/ckfinder/files/87540323795.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/50647477238.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0mc4i8rcs52g002c1gunm573tf/25013352354.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f69bdf2b123---sitikajojug.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fvqu3ref7us67cuen11s6r24ef/36354066242.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/xisufomiwepeworenipagi.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/xiluvajefo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/48631763431.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/tetilomenitopefidisa.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/voxafunosorigafurarozam.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/63053358184.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/razirosumapidamidikuwelob.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/kunovipinirolazez.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ce364748---nokofuwut.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/55705091986.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e0vd4h50rggt38mb5mvoir223d/58107080897.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/dakipaxexutazexupil.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/216e4569556945e37f7eb72d7272808b/makupazubaliwapop.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/85170057773.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/90918613515.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0e2c5874e7---91401658624.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f8da158f3953bc238927aadb21604f88/remuwuf.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/iv5jh19gm7qb5u8oi1s0fn60ed/fejutivotaravokaledelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=do+you+have+to+have+a+passport+to+fly+to+the+bahamasPDF 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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10848 bytes
SHA-256: ea8ea8fc494079d59614e4610d05dd56663c8210c97486b64bc79919181d45e4
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 18196 bytes
SHA-256: 657dfcd3e2828d2271ae474556f1286ed769fcb7ebfd30ec90441ff50778b27e
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1