Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22eb0a79424e58f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 16:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e932f2bb6498ad9026b18453db169868 SHA-1: 8e87cdd804299678c18be165839d90d0bf990999 SHA-256: a22eb0a79424e58f914da313c16a39343dcab27e7fc29179c9a9ae4dec89fb14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to manipulate search results or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bakoca.hu/files/file/vusokodapibi.pdf In PDF document text
    • http://chromavials.com/d/files/66326581662.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/tamaguxawuvisi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/45e9053e1aa3ab6577d7016d38c081d4/63052203369.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/birapomirakizawej.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/dutivixukanodemim.pdfIn PDF document text
    • http://serting.eu/userfiles/files/89541426378.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tubiwedezetitak.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/89328406345.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zaditedokimosonosijov.pdfIn PDF document text
    • http://indexone.ru/upload/file/topawowerilijesarewafur.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c940b46d---takowejovujamu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/73052966182.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8800728806.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/13061477533.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/77165578698.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/wosotuf.pdfIn PDF document text
    • http://horvathortho.hu/tmp/tesepizalabipe.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/supesuvisipuguj.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/58020954501.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec1051978---nasujexebewowefedasov.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614976fc0788e---mowusanuwimigit.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/xavetatoradipofezu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kekevu.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/22785348087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chosen+by+god+rc+sproul+free+pdfPDF 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 19116 bytes
SHA-256: 19fd71f067bd58ff1751cec94d972e8947fab0a660929036e2d809690fe12d93
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10932 bytes
SHA-256: de6c10d9deac6494ff1aa677c7163fcc71c2deed51b9e0132b8d8a0e036a1387
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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