Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2e1f5bfdbfb9ab…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 08:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11d1389ae0fa906ce6c638d8f5f459d8 SHA-1: b58ad048bc4a2ebc347ede932f6067a0a579b590 SHA-256: ef2e1f5bfdbfb9ab333e989789f029f94f8c74e1ab36756ec147cbcd89120831
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are identified as link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://habibitoursegypt.com/ckfinder/userfiles/files/44140951576.pdf In PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/fibavuxapagidibotusafe.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/vijuvanuralin.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33406352794.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/xujujegogeveromiw.pdfIn PDF document text
    • http://praguetransfer.com/files/file/xolenofik.pdfIn PDF document text
    • http://kunbot.com/upload/files/lasotabax.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/fagoveluxonowivunoto.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/girabojaxawunojojilava.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nawamojukidewesuk.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/wezewemikiwofo.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/26061654199.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb41aa7cd4---wejupiwowuwadukapadiwefer.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161435906873c3---11687365539.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e4e9150a---fevamoxosumajiri.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/mutivifoxejar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134010c07339---37245847637.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/32532266948.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/57754266707.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/30216970975.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/17562859364.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/peloguxurul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=text+call+apkPDF 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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 17228 bytes
SHA-256: 6ea502101679180ce35f6c79fdc0b8b852bb239db3ab65a31d66f564b07b3879
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 9940 bytes
SHA-256: c9e3f26a40ca7d4602ae42b291fbe2bda7642594b36c806f42b5592754a05044
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1