Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ae94f1f2060e28…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 01:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d802663ed3ac7716bed09e2f1a456a5 SHA-1: ef7fd0139835d920ea1175a4877005cb790fc37e SHA-256: 57ae94f1f2060e285dec286c15d4eb5a46ad335251614c96fd1ed5234d70ef09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ipublicity.cz/data/file/51091108489.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd1e0d241---jejisivogodimuvogal.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160710949cbfe1---89556676368.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b1ecuchrlamg72cd9jsm9edgh7/vuwatuxitalek.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i69aia3orpts9jm43lk4vq5lae/24130900748.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c80ba9343---99418374493.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1723defaa5b244eb45149bc6aef545d8/4685873092.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f69f00994---30551201334.pdf
    • http://allprintusa.com/admin/images/file/95091550000.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9nobntk45st3fbm3kfltuh0ua8/98365974299.pdf
    • http://bellina.pl/userfiles/file/22993891183.pdf
    • http://aytekinpolatel.com/image/files/46044519762.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106260842526972300w4gxm.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3l2fh9mfbjku338j91tdi1msem/47163003651.pdf
    • https://mszukam.pl/dat//file/70697140534.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074880897cc3---77151905383.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d4d01be2---nadowilisoxofilofo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088177a8c0ea---73941430839.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5b38b42b---87910590326.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sd2s08bs21l625kffisv7b08s1/gujazawenadolidunipisu.pdf
    • https://angkortaxiservice.com/userfiles/file/xusomitexisem.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d4a5cce8---15234227380.pdf
    • http://szyuangang.com/UserFiles/file///46478998998.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/193114edcb2891d96fd136672f9ed584/23412482808.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aries+sun+in+the+8th+house
    • 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_off0000f302.bin
b1550d2d698ade9c9be02c188e1a765ee0591ba2d168513bbe360f5d2512c69e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 10284 bytes
font_01_sfnt_off00010a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
font_02_sfnt_off00012239.bin
de2563cd134ac29e18d8e68bba8e590720d56f9c2def7556bd00e38d8e8043f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16216 bytes