Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9c2c660755ffea…

MALICIOUS

PDF

89.7 KB Created: 2021-07-05 06:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5086324b902cd02f7305d5779494ff SHA-1: f9edb66649eaa6416fa6eb3d4f69cd6b06cfecde SHA-256: ec9c2c660755ffea4904159d5eb0d47a0694c42ece9c40748e0f0c7e71744489
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the linked PDFs. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kaies.cn/upfiles/file/22613847786.pdf
    • https://uppersanduskyrotary.com/cms/files/File/53307838380.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/db85a8e73a0d404043cf54b39208c38b/zivowobiwotev.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21967b4b59---vizoguwe.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8db9e4458---77551637463.pdf
    • http://makinsushi.com/uploads/files/fufedugogekijax.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af1f2dbbf---xopegu.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/0ekr0s6oorilem74418i5lv357/96522093364.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8pqs98sjidak1g67pgacl39ho2/93925177899.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43d2d2e1539ff3284920b5beb15742c2/kamolumikav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb894d748---18336631591.pdf
    • http://szwygs.com/upload/22603958611.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d7or62oaiu99fhbr48ms4v43s7/40749012542.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16070c220c6b73---99702733795.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6368fc3964fdf839dd561766964122f6/46751991005.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/914e9dfa9660b953760109c99d0597f6/88652621805.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/5956c0962d06ae2571dfc6352e429397/5325035965.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/tl5gq79c7acbj0m1llud2dnnh6/lizadebipozuzininewav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=to+everything+there+is+a+season+kjv
    • 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_off0000fac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
font_01_sfnt_off000112df.bin
02a92c703c98597eb068266b6d508e827ad0c68351ab3d04c72b8f6d866f2773
pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 10704 bytes
font_02_sfnt_off00012b6c.bin
678f47de1a1fea17071b72ec43fbdf7f89c65ea084a427d2969c6c250797b70d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 17928 bytes