Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c7afb912c9ab77…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 22:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2adc963b0f3d925ad8aed9e31dd6036 SHA-1: 6ce5dff1056ebddd20703e5efb019e1e2eb94996 SHA-256: 50c7afb912c9ab77420d2c35fbbbebc2f87daaaa34bdbe8e61ae071b48c27f92
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise and potential redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://smidgel.ru/uplcv?utm_term=belarus+250+tractor+service+manual PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfac03ff1---30520274592.pdfIn PDF document text
    • https://iohrp.org/f_files/files/80233903391.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bomila.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785fc7e54ea---58997901866.pdfIn PDF document text
    • http://land89.com/ckupload/files/rovelutokidajadibanupu.pdfIn PDF document text
    • http://erdbau-rauch.at/86580387241.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/morojuli.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/00a82858275719644da2c607cf2b3d2e/26172718438.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/71183164983.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/53124558462.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/16274901258.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210615_B740E7E8BC158C0C.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/20814653428.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zedogugafekekikuse.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/lapekekav.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac24fc35bd79288bb7a4c7d2b03e9cf5/13614335323.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/visawejenowovuzedelezu.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/8729552158.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4211760c---fuzemi.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/muluwaxi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9a2ed255a7ec59b62c0b47ee03039257/25029067418.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_off0000b7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F6 10984 bytes
SHA-256: b5d5a1897b2ed73fa681083806147e769831be12472856ecc3166837d7e5875d
font_01_sfnt_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 16608 bytes
SHA-256: bc6889a2b064f68f9ec26f527acefb5ef3fa19eb64e02a6102157eb2ed39043c
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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