Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e0e4660dc3d8ec…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 14:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b845e9848fb85f9fd468672d48871982 SHA-1: 06664abba48855e8271e33c596ff9c34f9f8666e SHA-256: a3e0e4660dc3d8ec87cdbba7f783626e70d2163e8423ecc79ca860bb4fe2d5d2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URLs, some of which point to compromised CMS upload storage. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions, a common tactic in Business Email Compromise (BEC) attacks. The ML classifier and ClamAV detection 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://garglob.ru/uplcv?utm_term=50+cent+movie+about+himself
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024781dffd---12353763936.pdf
    • https://fnb-concepts.com/images/uploads/files/90813652934.pdf
    • http://alemotta.com/resources/original/file/vesudij.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/62eca30421987f3a4bf3e457fc5f9051/kujotanu.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca201e321e---86721877405.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4fe512f6---motup.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727e8abc1---fogigufufilogolulirug.pdf
    • https://afayl.com/userfiles/file/kuvuwawejekitivireluvo.pdf
    • https://adepotcustom.com/UploadFiles/file/20210428120752154.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b0998227---8211093757.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8dfa166e---46152023109.pdf
    • https://evpersoneli.net/ev-personeli/file/bagaxoris.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f6d73e8d6ff6928b4cf6c3e027a05f48/33782887597.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/71451820187.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/aef0dd75ec4aef93c7b0a530d820dfa8/kusevitoxa.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609388cead660---zosuno.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111ddd70f2---wefuzeleloto.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44b2d1b16---xapufatumenonevinumezi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7cae447---vidilubunozapad.pdf
    • https://argumentua.com/i/file/samesula.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/089600d4076974192ed6d29a667dbaa1/rutetuzezizojulir.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/450d10d7e466f0ef00373977c8e9e8cb/tukegokovibowatesawor.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2ee6aa691---34441605187.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4000e1cc9efcb2520ec83aee5a64fed0/wibujaxaxuta.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_off0000ed05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
font_01_sfnt_off0001051c.bin
b810f880d443971458234f2b933cc466211ae4fd48a7c341a5c94f1b0c78f345
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10964 bytes
font_02_sfnt_off00011e69.bin
2646a796baf2bf5bee309583f7cb911df76e132ddd431ab84b4d0152d97b5ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 17776 bytes