Malicious PDF — malware analysis report

Static analysis result for SHA-256 417dfe16f1cced73…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 00:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00fb22d134ee54dcd3a73f232f0d28f9 SHA-1: 53207b64cd74ba7f2b6d4984415e942a7a2bd980 SHA-256: 417dfe16f1cced73736434357ac732c58fc02da487d7a7a00205989bfdc8c149
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to further malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or scam pretext, aiming to trick users into interacting with the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=app+for+hairstyles+on+my+face+female PDF link annotation
    • http://projecthouse.bg/uploads/CKfinder/files/vopij.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b544b6b14---gerutikagaw.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/32183305701.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/82002093992.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/lefivotewaduligegakuno.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/lefiwuv.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/legomisurosol.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/32829045453.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/32697151615.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/89245446116f6dc8b1685408281cbc31/56714068139.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/vipexumimupinazekarobalo.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/makarit.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/kowapagerat.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5ae2c076---gemulebatoto.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/forulali.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/91519620027.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143b93b76fe1---jovogulovasexila.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/puzelunopufifipeziweruwe.pdfIn PDF document text
    • http://www.moyekolodin.com/files/virafemaxar.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pikudevofi.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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 17884 bytes
SHA-256: 38fe1154406e18afff3c77a7b9dbdc826988d7b24372b9c26bb3fa1998b16e5b
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10840 bytes
SHA-256: 731d12697c482019911381ac363ac5b9948f36c531cea3988620b79a128ee155

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