Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07fc58338a95daa…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 14:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1e82c0a3568c3600793875dba6e45848 SHA-1: 1fb066a7e2e4b03080ecef8a40a55792ef0502a4 SHA-256: c07fc58338a95daaab6bc171e33e1a9eaad404a79e626659d242710c382e6150
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for a fraudulent purpose, consistent with callback phishing or tech support scams. The presence of numerous external URLs, many hosted on compromised CMS upload directories, suggests a link farm designed to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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) or Microsoft license-boilerplate 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://archism.ru/uplcv?utm_term=the+witching+hour PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43aa9471ad---87370329739.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a557b485421---wanopi.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/1067765965.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/nevigemokupumagojatodokaz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607654c148ed3---93241348446.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/88870846909.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3f8eqmo0gujtsq355vu78fld05/30238723179.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-11/20210511012724358129.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea28e393b2---zuvalokexujupadowu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b408ec2f---poxivukaz.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fdd6c90ef7a8d256e2850f87ad4de062/fokenelisozubidi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dfirv98rk0iulv6ks2g14sfj2l/87416079911.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/mopefadox.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d90b800a65320f551f8ea3a256ca9e06/kenif.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/8462692833.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/752d933cae128dcb1b397724981b943f/sewurujeranim.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fudubafaxujivigitabemize.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608495eb6b354---zojaxoxadofimunurebopata.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/xowuxerafemulenebiforedov.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5def2b9---zodozuvatapugato.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/93h2khrl0cikrksihqbj99n85i/70615585845.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/43593928754.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210629_EAD995FA5FB34A16.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_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 10284 bytes
SHA-256: ac65c3e09248415d2bf08ecada9f5adcaf2e3cf77cca2b9b0942e3993f52972d
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 17428 bytes
SHA-256: eef558f3010bd726cdb54ca1e600031bc2e2cd0aeabc42d2a53305f86e89b8e3
font_02_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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