Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f3acaec5ae22f6…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 21:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c82bcfb5975d64934e655d5fad7f5e7 SHA-1: 4556740a47a5e4469338798bd71ef867c0417c4f SHA-256: 00f3acaec5ae22f6740b49ce7b950705162914fd2415335315eb73b81846d639
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, suggest an attempt to redirect the user to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling, a common tactic in phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aimic.com/userfiles/file/retezeda.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b9550c9c2ef9df4b1945f5fc66532ea/77747523109.pdf
    • http://huiking.cn/uploads/file/130451474651.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3bb99f34---tivakurenelosabuwugigagos.pdf
    • http://feg.vn/uploads/files/74368944075.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/metojepeberizelonugu.pdf
    • http://autobedrijvenindex.nl/images/uploads/41983415016.pdf
    • http://stringpoets.com/userfiles/file/40956722394.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe1e0d240---xepamejotilerigisemujur.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/86200589769.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/96166610120.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096f23064ef9---matusimapudovibobiwijag.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/86886311341.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896d51bd16---27114244549.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ba04db4e9d7c02fb7af99106c09bf4fa/10499796848.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508153231141.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4b4287f4---zexejifegor.pdf
    • http://aliceinformaticasrl.com/user/pages/23231825403.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b3d043d431826d1c44daa1e253ea5abc/81725632691.pdf
    • http://heibldr.hu/FCKfeltoltott/file/20961666967.pdf
    • https://groupburuemas2.com/contents//files/98082797834.pdf
    • http://ghalemdi.com/userfiles/file/jiseze.pdf
    • http://papinchess.ru/userfiles/file/32826262053.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bancorpsouth+routing+number
    • 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_off0000f8ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
font_01_sfnt_off00011106.bin
01646865d6caae7c884f802796af403adec724ce07aa74f2ade487b811e8d0ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 11068 bytes
font_02_sfnt_off00012a79.bin
2025ee99ab043ebcf45d65ade5cf923589b1075c7c9df1d99a22d72ea11834d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 17464 bytes