Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93a6a580dd49f5c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b038503f31a7c9df4d43095b950678fd SHA-1: db58498be1eaa42aabb26b2d8ebbf2bcf72043ef SHA-256: d93a6a580dd49f5cb614c4e33fa0e2183754a788858748a949021f9dbe0e3863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://www.lucaslobker.com/minor/ckfinder/userfiles/files/botufamefifog.pdf
    • https://dogathermalhotel.com/resimler/files/pazenijejefosemawiba.pdf
    • http://abwpetersburg.com/uploads/files/depogezadugevibunesuni.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/lesepope.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e135bce13416eeb5e720d9eeb9a8602d/35531898833.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e0c1d7ab1a91c58593dc1defea44bc9/felujanatuvesivi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34c17f086---19814036494.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/03af4e33a7c121150dd701e7e1e3121f/jababifeb.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3c0aee3842d1aad52cd242ab3f281567/4810042682.pdf
    • http://win-sonic.com/ck_imgs/files/59691585961.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/94924504221.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/mejojerekexuguku.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160816109b1105---juvakubokufusojo.pdf
    • http://brezov-gaj.si/uporabnik/file/40017093441.pdf
    • http://yhbinternational.com/userfiles/file/zajekuwukib.pdf
    • http://rayanchem.com/d/files/26722607678.pdf
    • http://cpgny.com/userfiles/files/zudugepurepunanerumokite.pdf
    • http://prodottoitalia.eu/userfiles/files/dobajosire.pdf
    • http://benthanhsgfarm.com/images/uploads/files/86829840094.pdf
    • http://pensionpoint.cz/userfiles/files/bagaxeferolajoxawo.pdf
    • http://charivne.info/images/file/38913337924.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+blank+eviction+notice+pdf+california
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06d.bin
30a0f1d8b11c79428bd3615e070e0a294b4d4f4edd34f33e59f2761b402764af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 18548 bytes
font_01_sfnt_off00011032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
font_02_sfnt_off00012849.bin
3269faedbd97670bc8d38b95496a0d70553f06f4b098bec0bbbc7d3e1be95d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10720 bytes