Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30e14fb92536c96…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 20:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f83edf5d6fd22daaa23ed520709e5a41 SHA-1: 75e00a0d5ba5d2135ec4d201fb6ebcf90ac7ed6a SHA-256: f30e14fb92536c96e6758c1dbb53b8928cad05838c84e4b5fac17bba2b4cf33f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pwmtqatar.net/userfiles/file/jitazan.pdf In PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gexararipifibufaromajag.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3se7vsi49veohr9b6ujuiceaa0/nevupajadisoru.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uib790utq07lnrbl4q8o4i79qf/68831487124.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/gigukojawowawozad.pdfIn PDF document text
    • http://one9five.com/userfiles/files/1847984979.pdfIn PDF document text
    • http://feg.vn/uploads/files/dikerozekezilaper.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/66139449177.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/84588795243.pdfIn PDF document text
    • http://shamayachts.com/upload/file/45004781970.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4c595379785f3d892cc71111efe09bae/42984197850.pdfIn PDF document text
    • https://steammining.com/userfiles/file/17926909540.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/monavidu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/bavebedilaneledotil.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/gepomibaledusekelagawap.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/mexoromi.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vivamob.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/62883333263.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sifur.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1b07f05a---nivoxafelowilalubupa.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/nodomoduvadijafasepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+sims+4+seasons+freePDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10376 bytes
SHA-256: 708ea5382f2c9ca212cf30694a5972332fe150487e066b2519cf1c40ff34b999
font_02_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 17264 bytes
SHA-256: 63a4de5037b217fac8453720a53b262527e39e1d7e8501b8053c09fc46b1891a