Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e579c3543e4f9c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-18 07:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 959f56d89b6527e244ca0375c47ad007 SHA-1: f39aa150085498504ee2e44709b996a6ab3afff8 SHA-256: 88e579c3543e4f9cb1f5f04b85228b2b31e8ec873772a126760b5accef459614
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/zazukazinonolexivivalu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12e886086---44108371222.pdf
    • https://casabresciani.it/uploads/file/45907940346.pdf
    • http://www.bufolari.com/public/immagini/file/92085914087.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3a6e31e0---nobozar.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709f554fb---40559552106.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608446c766f46---nugoxodulujilapu.pdf
    • http://klinikoral.com/img/userfiles/files/81155987183.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa44189737---miduwenunezumew.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1181dd7fb---68791969349.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d5677cb555bf2e326a119d72492d375b/kapitojadoloxizapib.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f36b3efc---robezalazatoxofilejorewij.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608204a1295f9---99127544805.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/bedijogis.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3896b634ae---zamiwebesozobikazeropizig.pdf
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/petiputiwi.pdf
    • http://ingmontagna.com/userfiles/files/wadawowu.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4f9e236b---zuwakamamixarow.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/14894088805.pdf
    • http://becucci.it/userfiles/files/36701773322.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d2560e3e5e8e0db264c6d94aadb65e0/dulevaseloroxofokip.pdf
    • https://aulacvn.com/upload/fck/file/15685943801.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024540105f---27105937530.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/73ee299321e48e4d729e6be3411b0e88/55312586701.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e943a5aa924---lewatunutuwaj.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/de7fbb22eaa957dac5789b1ce408b1e7/kuxukupetimevabu.pdf
    • https://csp-pub.com/stockages/files/40798999177.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=00+971+country+code
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin
fbf8a442a562b20405e84c6c639bb3597f81e8bc4551d30261c752bda08c123b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17200 bytes
font_01_sfnt_off00011d0b.bin
a43a7866ce1322e04768d2eca2d6c3f05c6930e6840ac951f65cdf3d378d0b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10404 bytes
font_02_sfnt_off000134d3.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 16252 bytes
font_03_sfnt_off00014ab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB3 16792 bytes

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