Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e5f0dace0cd948…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 02:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02bbb0ce7b842e974666624705e5edc0 SHA-1: cf8603d20fde86ec4d05f92b52014135709f3017 SHA-256: b3e5f0dace0cd9486613421fe06139439c71a6b02a7ee0a899d526f602b0a4ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to host further malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pretext, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=efisiensi+pasar+pdf PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12af8772c---88189422706.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/runapujurutobudodip.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zolewela.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd51bc2d9f---mudajep.pdfIn PDF document text
    • http://0048.pl/48files/file/jejetesameluzaderopevogib.pdfIn PDF document text
    • http://agrion.org/upload/fichier/22258504505.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/83890798424.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9516a7b5---71743728952.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/69132392935.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/xiwulupekobojebejo.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/46826279370.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/41685780001.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/wuluwovasuzuligojovag.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075847f3566d---24947156138.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/25073509133.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a64f17e6951e18d29147fa9c9c859b33/48971616360.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/jatezuruta.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/57284359243.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/homct9nlh5f5asiupr8d2q6ls4/99413445514.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/29959736469.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fe5nv4irrv2gfatm4fcsa9uu6t/kapawiperisuwofiloderato.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/48085851931.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kejunafunezo.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/70209675352.pdfIn PDF document text
    • 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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 17108 bytes
SHA-256: 57e4b65d4ed6b04d3831be4297194d28a122df36fdb702c30bc84502d95783d9
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 10212 bytes
SHA-256: 1c1ad20a910762f55b819025f9cd82cd59615a4b0ebfac18763282e3bc3b2ed8

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