Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bdeb4fc40cbd9…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 17:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baf63d64f9d52d3bd579567b8d380fa9 SHA-1: fd2becc1da4fbf034d63b0b7f69b16a723143f8f SHA-256: 441bdeb4fc40cbd9e3ec4711cc7a96e1d1ad70ef825390e8ac5b80df30ea58c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/38986259626.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/un8imrqbj8rtgf970fua22coh7/rajedil.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a780a05d---baboravukijuwifumuv.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/89b9b1fff81bd1f1611ebbf46d839fcb/finalafovolugud.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1e682d011500f07259e1abf6081096f1/tivemoka.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be9efd6c3db---xobutikekesusipurimuva.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca031acd4ea---bowiw.pdf
    • https://aprilboya.com/userfiles/file/zukumelatunelekobusor.pdf
    • http://hurtmar.pl/Upload/file/79411645137.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/77632a398a89f59373dd937a5507e001/6978902849.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/2815337667.pdf
    • https://uleiuri.ro/userfiles/file/51092060485.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/co7apuqlke248m5b11g3b4ijqq/51488415840.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/vojeso.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5j3ukgsjubvp7nbmgb1n534fra/bazilasiladat.pdf
    • http://aimic.com/userfiles/file/26637632895.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e63e8860ae5d108af499abea1676990d/83572046887.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3933e6adda---33565635820.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fe6eb09b86a608c90c93f8e688f27a7/5940547113.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c59104e4---84437419355.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd8154f2a---mejibumodalifovuna.pdf
    • http://nadiadsa.org/userfiles/file/69715172251.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a12f24d9---fopamudufowesozim.pdf
    • https://samarpanbharat.org/trila/userfiles/file/12593752036.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=strongest+punchers+in+boxing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16792 bytes
font_01_sfnt_off00012452.bin
1563baf6ebad398ad57fae1e56872aafdbb602c48c183d38a5c2c484f11cb259
pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 17268 bytes
font_02_sfnt_off00015147.bin
00aac9db4f9e6cb5da734804ee0074e4965eab6a49ebfcad1eb67bfff42d0e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 10860 bytes