Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ad6ad78f474905…

MALICIOUS

PDF

120.5 KB Created: 2021-09-16 14:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f2da85d84743ed0199568be42240792 SHA-1: 50682666c49c972d9c42ed51633223ae640dc4e0 SHA-256: 74ad6ad78f47490540089d2baeeaa01557d81373bc5032de95d13e956494ec37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to manipulate search results or distribute malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used for phishing or to redirect users to malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://schmitz.cz/res/file/60055849463.pdf In PDF document text
    • https://gfwofficial.com/ck_imgs/files/88946545427.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/pifumalivovater.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad529af966---pokexewelixujo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f533402fb1---tusaxux.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/19800112781.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/85555936620.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/56996087833.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a5d9ca17bc9cfc4e382f82c266590ad4/gavaraxewesijaniwe.pdfIn PDF document text
    • https://laps.pl/userfiles/file/81318363464.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/petularugiwikap.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021915324107.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/wupevegisurateresiminazi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1244ta5534js1l5io4li39akt9/57291672580.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/15271559299.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bapokisowakenub.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/vekixoto.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/18914802666.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/juterabigezufuka.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vusefo.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/puxugirajelakisika.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/vijubipuzazaxamesenifike.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/namitexudase.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bipuleterakozajegilolok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=number+3+on+periodic+tablePDF 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_off00016a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7D 21456 bytes
SHA-256: ae3fe5c3b891dab0bdf000123e4263d32704806805b4cdce1bdcae05aec8bb2a
font_01_sfnt_off0001a314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB2B 10896 bytes
SHA-256: 4ed586d1fac1b9b4244de71d342d389227c1a610f9f3b681e156cf2ae8e15d0e

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