Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd6f6ebdab48326…

MALICIOUS

PDF

94.9 KB Created: 2021-06-29 07:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e26983778ab2e3f61914cd2f4ce187a9 SHA-1: 2e98aa9d3d083477b82074d044413fb4d4c83db1 SHA-256: dfd6f6ebdab483261d1d4a1d0edc4e13e1de5d0f1cad39da30475bc4711959ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9d0b7u3mds6da11n8ckj45buql/25723062207.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/39748562151.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/03a529fd73b650b5a6ada37057ebe84c/54172374137.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/11536058004.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/07qmkspflqcqgq73ct7tnpi0o2/sarer.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/196hj6ti1bd3ji9v53te5hbtga/58136522682.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55293266218.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210623112149.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608778479f7dc---jodofoxozujebowizixopa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zalamedexotepudoladef.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/fimojusegubixon.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vokapekoxukiranef.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f377c09470---gafuvewodis.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e67e9d17497ce6671eff7fc21f6d71f8/nudirapupu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bukuraw.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/zajenubedobukesuv.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adab3877a31---74837401372.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098725bc04d8---rebepojijunimijuduxajebex.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/nozijokemikewiluwabugeni.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qr35h2sadk15r6pauo328datk7/videwunexefabu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/tuxetakaxugukavudeve.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/67737163489.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796f351390---23141285641.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbd81daf5---jidepepavozaviwuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=celebrities+born+on+may+1PDF 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_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10608 bytes
SHA-256: 895775d503ced54d2d58dbfee9a8978300b667c2533f0e5180fb82fd82daf9e7
font_01_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 17528 bytes
SHA-256: 5e91bf2cdb87e2429077ff4606b911b4d261c6b37eefe1e917b2e6c48cb2ca6d
font_02_sfnt_off0001565f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1