Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa03f0c0beb102c3…

MALICIOUS

PDF

107.9 KB Created: 2021-07-30 10:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2924e6246e93af759c0aa7f4386b7e2 SHA-1: 13cc247d2099848c313f13182eb773cedbd2a530 SHA-256: aa03f0c0beb102c39c205a3e20921585f153debcf9fa1d31d38c709f9f5b7ee5
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=gift+code+game+goddess+primal+chaos PDF link annotation
    • https://karapinarinsaat.net/userfiles/upload/file/84594716785.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/runeg.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/842a2a250fd3cdfd86f59b945a787ad8/69648331629.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091591f5b884---xifekogufamopimix.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/metuxil.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/21952067272.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5196177d---notajitugumixufazim.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39c4bd18b---jiwagijokibadebekosopolib.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3cf44773800f3ede65d8d7554cbf2fd5/44691288385.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/lureworuzonarereb.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ec533ab35cd---xikerilodugavutix.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070d47b10859---loxasup.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k16jm4hjbm63q1o7rmgfcvknr3/sofuzoximedibiwibugur.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/95727319387.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/94909057667.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rafunemu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f07bd02f---xawubijeso.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb40336b7b---638187949.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0e4f33b---leforo.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/javivamupenifebogi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f360f3bd522---xaziwikabuwis.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d049f9d0---71859977580.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608141114841e---60700792632.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • 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_off0001411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 17576 bytes
SHA-256: 3b7a5fe2fea41e2fae1f49feaa7ce23098ba0bf3bf1e55ab5cec97a5d506c475
font_01_sfnt_off00016f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1D 11004 bytes
SHA-256: aee5876ac227ae57b8b2186ef3e3a5081b72c7209317cdba900dba59206c8ae5
font_02_sfnt_off0001887f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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