Malicious PDF — malware analysis report

Static analysis result for SHA-256 12470abc97d4e978…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 20:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b75bbcfd856cfb603eacd3129f1c9648 SHA-1: f660121398e6e1cd97315c8cd6d1ac5ed02ec47c SHA-256: 12470abc97d4e978f35900503a062a691b3528174c3a69a60bb7d38be22f8d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b0cdcbbd7228415220cb2b7f6a96082a/28511018164.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef93e80176---19413679192.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca554a17b---72238082124.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717c7d6fceb---82752429339.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o2mlm7v539o380ig036543oel4/xawenotesororawozuti.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7975aa0b---zukobazufupofawinaxebix.pdf
    • https://eucolait.eu/userfiles/files/84504854443.pdf
    • https://a2designbg.com/userfiles/file/6067844008.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5e946e2e---zuminusaxif.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609060ca0f3dc---94836073027.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009808fb12---24910726225.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65907453b0---68102326204.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3e9c892a2e0fce2e856e08c5172cf080/92812184246.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/7ae129c2b0d0ade98206240a8b42fa76/64122096932.pdf
    • https://motoquadro.de/userfiles/file/25381236241.pdf
    • http://wernitznigg.at/files/gazexuxobimedusuko.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffed3cc7b7---lawero.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958a9258e67---60589603832.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lbm9n1o7scg4jd75e5m224a7h1/nirutazufilitafol.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20628eda71---73776582751.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c0be2838---5190958018.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cacebe52c4b8ce60df36d930cc3fd3d2/sufulawapolukubivugix.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cb85999f3822b2ae78bac872b77b0708/wujelogekedizufu.pdf
    • http://movitecnic.com/ressource/site-image/files/ronafomofisunudibe.pdf
    • http://omonetach.pl/foto/ilustracje/file/4096226130.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/043c85c22d708f5b4817b96aa5eb94f0/28674247546.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=1+and+a+half+year
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f527.bin
59313b2a9ca43c6288a7407f152babc5e0ec9e47587dd29af4a7170b39312503
pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 16688 bytes
font_01_sfnt_off0001204e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
font_02_sfnt_off00013865.bin
ccaf29d652ca97d92d7c6726d5fe2b6352cce6d3a3566ae5d9ab43b88a6d9e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 10044 bytes