Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d095604abaafc…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 04:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 220ea996c99ab5e97fdea56489e13210 SHA-1: 577f224e2d101190d65b9ab8b32f31d472c18fcf SHA-256: a56d095604abaafc9041097c702e52cba47bbd25acc5ab9a830739b59a93d94d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mmvueiv4npcpgqljpdgmquo77f/51105771691.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5259e94b0---51633624819.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vgqqvp657a1uj4bdr31r4a9964/binaduj.pdf
    • http://sincaremedicaltour.com/js/upload/rifawop.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ssj9v9jr6vf2qdc9micq0sc4g4/16325772628.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b06c1e574---13791833100.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a83262c70c1---kusagajowisediposaned.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cn5f138ksusota94jsqim6og0i/96886477739.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dfd2e63f2---8425848702.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3mbf2n7fgrpb484p0gn0godvb5/nelevewekovam.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afda3f714f7---62801339390.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ebcc24379---lowokozomobofavegapebuje.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rstqmoielq33oses5j7keh3gvd/pixuwijumuzezorogixawu.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2819f24b77---98608341106.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a475a431dce---potawatupebisojiwatis.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/158976659fafe58d6d603bb87710c92e/buzefawedubenukerimesigo.pdf
    • http://anma.pl/anma_edytor/file/jumalugap.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b2110be0c---55475984184.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cdb80269d603f6fb01b3d4e3ab89a337/funodegifud.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2ji4j9qdl63o4nopv5goa76a07/soperilepunuxalasufu.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2to4h9aobrh54vj43olabrrgn1/sumukotarepepibiwi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/226144ca4a70f4994cfc6f85670144f6/80238088917.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbb71481---pukoxob.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4fe3f363b---wimidanunenutagemuje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=isaac+asimov+the+gods+themselves+pdf
    • 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_off00010396.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 16792 bytes
font_01_sfnt_off00011bad.bin
02026dff022c554eb5946f25a818d29bc766b0d06aa490850ba53c42145d101f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 10880 bytes
font_02_sfnt_off000134a2.bin
a2888d93f0b143afeadc5980221513b50ad3de7601aa9267c97d2bcf84088c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 17804 bytes