Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cf7f2a4416dc7c…

MALICIOUS

PDF

93.9 KB Created: 2021-07-10 06:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0013cc9812e7a323f384f39ecd00fba0 SHA-1: 593353f2ed252fb9cc9ad1b9d5f2090bc8018a88 SHA-256: 34cf7f2a4416dc7cc95884abe05f39e538538ca067c24080e876ef86619db8d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF structure itself are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/2fb06e456865bc1b5a3e914862bc4706/12199462088.pdf In PDF document text
    • http://dailycan.com/userfiles/files/banemapimadosunup.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b15de278---84391037531.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797b02bc637---57397937452.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/35c70f83384d0b73a5cea3dc3d93a00d/weripujuzodilad.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gudixoli.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/99460922566.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4df03adfb74dc0adf15a73d48c4df2f7/99267694218.pdfIn PDF document text
    • http://darec.sk/files/files/47289947849.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/94708077324.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vosubilivawidujasarifetix.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/tatenovulupedugodikak.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/jatajusepefemiduvo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/91965445530.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/lofunezesiv.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/14053980306.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863352edb9d---kakufudiwokigivapawudeji.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8030aa04---kurotenanepa.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/f4fee996a2c1aacd14983f783f54bb1f/4839255495.pdfIn PDF document text
    • https://pindimana.in/uploads/file/nawuwegavuxaso.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ee5b23856c3399948a68e6c60abc3d25/7269271585.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d71c3e79a8925656973299d2da2459a4/39914584212.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/54fe6f7c53416431a215e4051d4a309d/wogigedojunirejex.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/33596905408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+iodometry+and+iodimetryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16900 bytes
SHA-256: f0763143de9bf0b5d30e8d561b054254529dc9541c3ea7c1090d4f8fde0370e1
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E4 10764 bytes
SHA-256: fb5ecb9a99ef6182762b1a23418a4032eb0666cf26e762e4321b2950b48ac209

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