Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a7de93ced9d18e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 05:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b85c4f306537f3d11a13a8f11fd715ab SHA-1: 28e3ddd9de0abf054e83a1bff9a011af11929208 SHA-256: e8a7de93ced9d18e3790edf696eb944ab59de637c3c957f3377cdc8300d58639
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://enewind.com/pliki/file/laxareforarovekiwinule.pdf In PDF document text
    • http://rsentco.com/upload/file/bopugazilu.pdfIn PDF document text
    • http://portableandcool.com/files/files/kuwesiluzumok.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdfIn PDF document text
    • http://rcot.by/pics/files/18478590514.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/vedafexeposovenus.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/85799212164.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/jinenolitisokuv.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9b8662761173a83fe1ec17d4a4f0d6fe/58677906993.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7759d8fe1---rutarexifazixiso.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/tofudozejif.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/50068205892.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/8404130840.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/virajotanilupedulubur.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/55679348494.pdfIn PDF document text
    • http://clingac.es/d/files/70867687017.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c561b9d14fa23e28feb0eeaec67dbf1/nasunoxefeluwak.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84972058134.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/63516505609.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/babanibaganafex.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/8281314034.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161337e7dc1de6---80648631741.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/259de2873a926b404ce2315b5362eeff/67047499740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+vice+city+stories+android+ppssppPDF 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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 17776 bytes
SHA-256: 99ae9df1fa039cfce7c3a6368902410c9f5adc584f1f9b50779de62112ae9d8c
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10680 bytes
SHA-256: b909f2bd82994950e070c32b39581e83a7adeb1aaf7a59b3a5cfcd77d3eaa471
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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