Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6087d0c9654276a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 23:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7135368d7dab6cd810efa88f689aa846 SHA-1: 19d1cfdc0e6ff372515454a8799055ccfcb1ee47 SHA-256: b6087d0c9654276a81536924a2d089e937ec49960395cc8f7dc5f96cabd972c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accuratesearch.com/userfiles/file/47820016017.pdf In PDF document text
    • https://aulacvn.com/upload/fck/file/79715221529.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0983f737698d9e85de02ef6fe13c73bd/8058988844.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pewebovakobososisiref.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bb5f4e5a2---80782253662.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/piripizirile.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/papotiwedex.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072799cc47ac---doxipapikizazixagilefewej.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6c236b70---nefuvobusuxaxojoditak.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/77726553340.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c092c24c---pijiparedurepoxutom.pdfIn PDF document text
    • http://rayer.cn/d/files/fowilibebolujeto.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-7-28/20210728040751326719.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gukozovonevaxetolefojelis.pdfIn PDF document text
    • http://ahchala.com/img/file/bomatakapopitom.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a9a5ed5f---jirobuwefedakoxasenitup.pdfIn PDF document text
    • https://palet-school.com/files/files/10124131986.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/38960804408.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d8355f1e---25192022820.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfa6d9c98---boxag.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/80662545178.pdfIn PDF document text
    • http://omg.su/upload/File/pigazumijo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b224c6fcf---tuxewerosemujuxezu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a660861---50402177802.pdfIn PDF document text
    • https://dptech.vn/uploads/files/79267120062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jurnal+kriminalitas+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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 10592 bytes
SHA-256: e5269532e1ad746ac04bb4dc268c65393f4e7086a4ff73ba503c02b1af76952d
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 17124 bytes
SHA-256: 6e57fbd5b4efd6e88d25c7fe165dc1d380605d32a440b8778c667c4e3402a8fa
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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