Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd966d90ec4fbb8…

MALICIOUS

PDF

73.2 KB Created: 2021-06-03 11:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ace80d6fe2affce6bbf6970f58f97d SHA-1: d31134a0554e0bcd71bad7a272182582671c8798 SHA-256: ecd966d90ec4fbb843586254d7c2cb53ba1276032e696aed7a9257cfb23bb92d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage. The document body, though partially corrupted, suggests a lure related to delivery fees, which is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://medvor.ru/uplcv?utm_term=how+much+is+the+domino%2527s+delivery+fee
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091578eaf30c---setukotomuxomijedozago.pdf
    • https://aokman-drive.com/d/files/68496710972.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/87fe51fd734c86c5f6d58c6326490ba4/15313104200.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd1cbef57---jotazu.pdf
    • http://altinay-law.com/images/file/xerefirepawas.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rf8p0880jdh3e17luq1tsb1cod/gatamubananarozofiduve.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bfa87d8de480804a1eeeb8bf7e4145ef/sugubusitesavezuladuli.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0890cc1445---datosu.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4chpk0ri91pkp6o439hcfsj53d/fonawiworilitofapogajimu.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/815692669.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/og8oe6kld6mmtcti518pjdre0q/roteve.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ebb83ee0---fulefewujatitapixit.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/iv16pelsr0j32ickaefono0vc0/77808390882.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160742ce50a9e4---nogib.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c976b2066e747b1ce27fa1746338e2bd/15383027470.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6751260aa3---77324386415.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d460.bin
6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 3016 bytes
font_01_sfnt_off0000df1a.bin
6c316f7c1b5c5e1316bce68309489631bccf5ec81048a4478e3d6105b9c45bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 5300 bytes
font_02_sfnt_off0000f11c.bin
cc041f8ec205c1b6069eb662c80f4ec2539efdd987276f6f8f8a7a1d2aa5edbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 11200 bytes