Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecc5b4e95de1b2d…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 16:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b3332afa79e0e297fd866d0719684d15 SHA-1: d1524643ae809054f9756003b9f90d33ecd9bfa0 SHA-256: aecc5b4e95de1b2d149956f92a8d60ad5e5a6f5d3e87bf934ca5b0e66692c269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to direct users to potentially malicious or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/262c4123afbe3cae6a594f2da614349f/62837864485.pdf In PDF document text
    • https://kaptenhoki.info/contents//files/kakalebujurebagekonobik.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/togexumara.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d979d27c3f---feraselotelupiku.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bataperuredu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t6bmeckgk1ovumei2669iu2c94/13992580386.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/75971195846.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac3bdd539---73226667642.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bab23e3bc---24247715373.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a3389c47---bibixamupis.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p6ijdar73jesv75fvn1oqkp7s2/62527818853.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210602120005.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210531113642175.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/74755520040.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f663a2d5---73543603333.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a80360723fe---68878885201.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/64f3953cca9072b7c8a48a814a4262ce/takuximuvamatilidek.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/57744819938.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4db36cf804588080d7978386fdb7c2c0/dezosotukedip.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad859affe8f605a23fa59639d940b526/51579392003.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/edlarbhhbnt7bpvlk4jsuor4k2/jijuxagilalunulaxefoj.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a55589b4---sipexawokazulitudixen.pdfIn PDF document text
    • https://elcoengineeringco.com/userfiles/file/diriminajumob.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077057183396---duwabenizutubujux.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074694069273---76270617791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=shortness+of+breath+and+coldPDF 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_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 17344 bytes
SHA-256: 4affbd3a7bab5584c250f092d09385c4bc336dec8b20fec7b0a25dfd6530d88a
font_01_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 10696 bytes
SHA-256: e3864d800550f4ea9689b32a7734c7b35457b8cbf11ffc1858c2dd093905567b
font_02_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1