Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efa240bb872251e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 03:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17c3fe52223f6acafd5a6107fca6e6c9 SHA-1: 8e43064931daae41acc4770eff803e27f86d2699 SHA-256: 5efa240bb872251eeceb92e6afe34e868f0fd074def42f7f7b52e28bd36fb7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised websites and disposable hosting domains. The presence of external URIs and link farm structures suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=cardio+workout+music+free+download PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1354ddffd---muloxopoz.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/lopoga.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/75620478287.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/zomerozetojixavapul.pdfIn PDF document text
    • http://dakmet.pl/upload/tasewijo.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/96c93ae49f2d4916f200d1fc8b58a2cd/68301480964.pdfIn PDF document text
    • http://precisao.org/files/files/mozamebifofi.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/89180737129.pdfIn PDF document text
    • http://belst.by/upload/file/najiwasodufowujuw.pdfIn PDF document text
    • http://fittbike.hu/files/file/tavisapekodarazuremerewe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7uk4m6i3rhds8evtr71cbv5jvb/nozawedesigenibisabeguf.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a3386e7382922b84300aeb0ee7cffd9/sojusizi.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607084691e2ba---97171262752.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/mopukefapadodapob.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/liludemopivudovabob.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608241270af6e---34002077458.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609db965e4bec---xowatedazoraveziroludumug.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/33731788681.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/22637180837.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108101958271973.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/50807500202.pdfIn PDF document text
    • 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 10944 bytes
SHA-256: e5967d59df10303864ea3544b18c1702ae754595f7fada5ebdd2f31d4ca5e06c
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 18468 bytes
SHA-256: 4359b51db33bcff5fc39e9732fb8144e890135f9c77280534698afecf65bef5e
font_02_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1