Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1c4fefd590359…

MALICIOUS

PDF

85.6 KB Created: 2021-08-06 12:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6f88a3c388fd27950651764124e0ab4 SHA-1: 1b4c1e55df86bf56823502345809ea360c624e1c SHA-256: d0c1c4fefd590359e95139e1eef845927a340b2c69dec700bdddc24b732a464b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://m2m2design.com/userfiles/97690388729.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab11560473---8253131792.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/66380824503.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/62109f3570494bac4091dfdf8d68850b/putafosebifixepakigafifof.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7149a4fb02---11077515815.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/907e50757b417ebdb7e4408da13aa56d/jozizafalawew.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/42839318900.pdfIn PDF document text
    • https://maisonforville.be/documents/file/87083231534.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1a8ed6bb12626217c0285926aa6429b7/zozobizokogezepirip.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1db56e2ded3d8cf11c73aa5c3a44a6ae/86875584945.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-25/20210525214925394320.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/u43g9h6aq65odi2cghej98a6oq/70418921557.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/53654513317.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802545f1781---ligososivuxix.pdfIn PDF document text
    • http://chenruichem.com/upload/files/36886765878.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b497620bc23---kuvubi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3f28b30664339e76bb6f5fc8b7e5d256/54371727728.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55611da9a---42208245721.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sgj66iv6kfk5sllk1t2uuem4c3/97999769429.pdfIn PDF document text
    • http://jaht.com/userfiles/file/zuroforakevusikifesajexig.pdfIn PDF document text
    • http://sb-78.ru/files/file/nelobuzozazodev.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/delinakajuvosatoxoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mujhse+dosti+karoge+full+movie+download+movierulzPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 11328 bytes
SHA-256: c6e698bae21096d0d6e2819ce7d375feee160b2a6ba6c93acf66a11e257edc21
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 1864 bytes
SHA-256: a42c3a89799b31971b5ee7e28ad9570a414cdbc54937a38966f286a22316f170
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 17472 bytes
SHA-256: 3e6bf452ac8a65f6e0f8d1f62d89aa40244afd23e952be6a25cd73f37f9670c1
font_03_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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