Malicious PDF — malware analysis report

Static analysis result for SHA-256 588a7f2e32552d0a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a649e98b74d2a80d9398ac2f6c6b813 SHA-1: 1a0b986c0e0b92dfba2b24ffe35150b39d80e1b8 SHA-256: 588a7f2e32552d0a23bb873b2765d34897c2e18dc9befb52e4a456fea0f11845
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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 http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/28461037118.pdf In PDF document text
    • http://digilit.ir/basefile/digilitir/files/liramunirijakil.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ca7cbf9865ea75b6afe1a6fe11e62251/zafabojajatajatiwo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/bupurureja.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/77069971503.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/fepeba.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a279720de---wuvenimedakosajavamitadur.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/49933c7316630679d919b325ed4cc1e7/3187636260.pdfIn PDF document text
    • https://turbooto.vn/upload/files/3185232152.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/fesuvofeserite.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405d0066425---fazito.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/509110475.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/gizewulogudo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/90265930505.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/midizudivekusaxunejime.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/60727729140.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/webujoleluvev.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11802231483.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/jubujomefitupofi.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/lodumifa.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/97661283610.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb94e2d170---23341881446.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5a9f1be7---zelutuforava.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/49080749703.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/metilevijidoba.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/79027966566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=real+racing+3+latest+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 18140 bytes
SHA-256: 2a51006085d2151c2566c934543afa0754bfdfe11d858992f8dc0934c44fa4ba
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 11164 bytes
SHA-256: ea8fc889ba2fbd63a18fa08384098fa475d79a57c1e1a7199c071d4e71b59baa
font_02_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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