Malicious PDF — malware analysis report

Static analysis result for SHA-256 87781bbb3a4baf80…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 04:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 923a42d93172cc9f1b9626518378895b SHA-1: 1f920c74a63348cb089b1e83150165d1547bce40 SHA-256: 87781bbb3a4baf80ca2e4435ffcfcbc324b74f7231f8a44c19f3ba805e8dda0a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL explicitly mentioning 'download gta san andreas for free in android' as a lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly indicates malicious intent. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=download+gta+san+andreas+for+free+in+android PDF link annotation
    • http://vvk-wiedermann.at/userfiles/file/xidijolulerikaganuwigo.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109021416238474.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e294ecc9eb---jujogubotu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/firedovomajipux.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/jasadejubopuladepuji.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/tonugover.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/somokejusazepupeweg.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/11074414459.pdfIn PDF document text
    • https://duel.pl/userfiles/file/25044755451.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913210056.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/vorugesesitexanidojalug.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/sikojazamekepida.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/xofuwaforenexumogat.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xowakel.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142421c1b393---wiwuwiserewedijovuworoju.pdfIn PDF document text
    • http://tabletopad.com/images/file/wumugutubilomodar.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3ac428fb---74193533688.pdfPDF link annotation
    • http://caogenzhiben.com/filespath/files/20210907135252.pdfIn PDF document text
    • http://oilspecchem.com/files/99177146130.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/88453675232.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109051251474044.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/faviwufemimowiwabasisani.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/db2dce0f05213ac5c55ef0b4bf6eae83/winapi.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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 10616 bytes
SHA-256: 1826376d267fb56a61927fa6df52db97dd635082d00e04095f7e2855dd0354b5
font_01_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 14416 bytes
SHA-256: 36b091d2034ad9e703641aaf953a67ba2ee9b28aebdf72afe3e46a46ed4456e1
font_02_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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