Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87cc70b0554b35c…

MALICIOUS

PDF

103.6 KB Created: 2021-06-28 01:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5a901e92ea122e67fa8a660a8bc2f95 SHA-1: 64c506d83da0abc4a95108c2caff096158c535c4 SHA-256: a87cc70b0554b35c795ea829a2f7836f53914fa98b156ec1a342624dc2f95b2f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and contains no readable text, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cnex.cc/images/blog//file/16104348214.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160990d1162536---vawesudevulalexu.pdf
    • http://sva-jeanroze.com/xmedia/file/33968942618.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdec93b0ef1---78227558110.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/21313107902.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/n549imaog9lr402f2l2fd3ev6a/47516031080.pdf
    • http://susutour.com/userfile/file/zidemowusimarolabod.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b7e7c4f4b31e46e302375e6b3e888861/4741186966.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160840fe12184d---numuga.pdf
    • http://misosmile.com/upload/editor/files/96527227795.pdf
    • http://aryajob.com/user_upload/file/wavano.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/31180dbe673d9c339a18be73b8d8a369/bumiwolopa.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21288526246.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914cf6377eb---23933409150.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mepadelixa.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8cdfc312b65d474b1cb73b1e03afd47d/47077134819.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770b9d2f65a---32128586646.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ht04ccl9surjb7go4nrr180bd2/47310165157.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098083b8255b---64955038696.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67032bfb06c2ae1c9dfbc526cefdb76/43676351218.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6068657232660819ca87753f25b856e0/vanopipono.pdf
    • http://hasici-pristroje-eshop.cz/files/file/numaguzefazone.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e9bb84a27e737340bfe0ca1ab8e42352/ziwuronesefusuv.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d2298e28---18681186679.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simple+gk+questions+malayalam
    • 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_off000122b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
font_01_sfnt_off00013ac8.bin
b068b9dc7fca75eee8210cb2d6b7aba4f14c474f7fcc6283cdc3fc3e0cb633c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 23692 bytes
font_02_sfnt_off000177f9.bin
f7e238abca579f93b1f580c7db00c6c1cb95b9dc0e9a61bdec1f6e01dfaa5cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177F9 11024 bytes