Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e74a9eab8fd688…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 330bdad9935c07625f6bf17ecee6fe78 SHA-1: bdc8cbcc22efa97e1d5f733784f64f54f0c99496 SHA-256: 08e74a9eab8fd688da4f0774d4bb9be538e97e238dcda8eb0287db1ebf79a63b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c3791a55---96376767178.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7327bfd0b---14272818992.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jq4s6nvm7986v13enapiiqv4f2/84749686575.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/37521826d23a499b1b71db17a5d38daa/65229732420.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/51b18e11201be2a7626eaeba6b4a232a/podefumosobikado.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/lufezemoperudimorudo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5b223266424484f39d9adceeeb46b10a/mavoxa.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e7a8c786---bajotetukudu.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/d358ee4fa5e5649ce9d0fd09d7728888/tudixusugunilu.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/81477475071.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/35560738744.pdf
    • http://myjobcareer.net/userfiles/file/2021062500532773499.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c915f20eec---paneleperu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b54f023c4---63866149188.pdf
    • http://thaiboxes.com/piceditor/file/36761992338.pdf
    • http://mu-rrrc.com/userfiles/file/pinojibolosizinafabuzete.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f2b9257d8de4530eb4e660f111a9088/34224079018.pdf
    • https://birotex.rs/images/files/vimikufunaromozaka.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/74730d546707dd68d534ac59ae277c1f/750449237.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/982e475c487fd9701231d0c041b81345/dozameligezavil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=normal+calorie+intake+male
    • 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_off0000f0a8.bin
a5c2b75cf5bc9d9db179b34747343529672a2f167198106684d041f659cac46f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10292 bytes
font_01_sfnt_off000107c8.bin
452c0606aae09cdde194d9a8405b33024ce819fa48d8aa6a84a204fc9812dd6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16224 bytes
font_02_sfnt_off000131c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 16792 bytes