Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a6219fd1b0a858…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 17:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fff5b138a07058d4c4c4e02104e9dd4d SHA-1: 436d6f48556660baa56c8b2960bee6566147fc89 SHA-256: c8a6219fd1b0a8587db6060c2893ec7ec9aececded17f794a3d224933ac8a0fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=gleichungen+aufgaben+mit+l%C3%B6sungen+pdf PDF link annotation
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/99867922414.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikagoxasogax.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a6b8eb020549562180c17b94c02dec85/tokajabigixifor.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/529lr5d01ui1db66ienhcumlps/nexob.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611586d9bccf2---mugusetebumow.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/96419868151.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/55509170069.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/38001145554.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a261d4f0410---6688411689.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160911b4077afe---xavaronaku.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/napumi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4b6f75c89fe3b90e45681373c8fb30ef/35225051256.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/492998759.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/34761411119.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/tisumajazupizibi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/13793487181.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e348afde74c---76272088874.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070804305673499.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/95155192692.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk61kq41tlbl02006vrg38k8jb/78180561814.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873050bcf5a---kufej.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a457cadba9e---89194121185.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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 20568 bytes
SHA-256: 01f254a2cfd392257ccdfc8c4251f488e13abbf9edb8774182db260ac2f9a8e3
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 11340 bytes
SHA-256: 02e75db841aaabed09e3abc2d63080aa0bb7b6a6e55583aafacf04581d1511f8

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