Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac97f2670cd46dc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 19:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fde384fdc90e039d5397909762f457a SHA-1: e67c26a14d549d72051881e1435b11e4ee1a4075 SHA-256: cac97f2670cd46dc578968577624458052d9a9418fa1c6d4fcf05d1637f25197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=toro+snow+shovel+manual PDF link annotation
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubih2f4aa9ges3l8qnh7go1ibl/vujujera.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6e20dd5c---ligekolemajosilivesa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43cc62bcab---79459389606.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/41802013583.pdfIn PDF document text
    • https://everestart.com/images/stories/file/52039829983.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/70415890344.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/23112361155.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b835b03392c---matid.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/49383956015.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a526170f85d---89520495073.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0f3ef90f369aa84633ef04c799ae1af6/beviluwegaza.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9042cf18b6f4f6c0ed6bb056475c2783/99002490380.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/47235127895.pdfIn PDF document text
    • http://iworking.vn/uploads/files/lulenijifiw.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/vokapusutajonu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2ser1kjq582ie548kv42sa38vm/17772430718.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/zupuduziweve.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ph39gprffsi9rr8qccn7f4dqtc/61781819297.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/31818796909.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//38881927964.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/jipadepogutetupoxatotiz.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vonujomer.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/kelukajowasuzepepoxi.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/setixalevifedozamobi.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10396 bytes
SHA-256: 691530556b492accf165c1e9d10f3234b2e3f98c34891691a51a242490bcc8aa
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 18052 bytes
SHA-256: 3f5912b81bfd68a6e403e712282773c544477194ab4c0b4726aefe3ef28abf3f
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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