Malicious PDF — malware analysis report

Static analysis result for SHA-256 3272877b650c0095…

MALICIOUS

PDF

67.6 KB Created: 2021-09-19 07:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0153d823e06e12b57ada7f684faaac12 SHA-1: 4fd080d9952649de02cb86d96bf6691d78114fbc SHA-256: 3272877b650c00956a598bbf1b71d4ed382aeed1c7d54531ba849b9be63f74c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking an embedded link, likely to download a second-stage payload or redirect to a phishing site. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a campaign distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://suthuytinh.com/app/webroot/uploads/files/46691446342.pdf In PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30318773499.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a45d18e6---75499827401.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujebud.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/ruxupu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/zigevijanesipevux.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/39857455368.pdfIn PDF document text
    • https://mashura.co/userfiles/files/82099242567.pdfIn PDF document text
    • http://partnercable.com/files/79536775703.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/10788648999.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b9dc7e8ab---183995698.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/9447502498.pdfIn PDF document text
    • http://artdental.hu/editor_up/92403223492.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091907071173499.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630781319.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/sonij.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b211a31768---74959335445.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/49655706258.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cfa0dd925edaf70f38572f90383b9934/73440313173.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/koranareweka.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/47717637454.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c25dbb8542ebd9e352088287084ed7d2/61742196827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+kissanime+app+for+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC95 10864 bytes
SHA-256: e45a68785099d213a0b1fce7907be5f3150124ee3da87b4d64791d0e285c1ae9
font_01_sfnt_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 14232 bytes
SHA-256: 5545d63276768cc2537477912bf28671fa792f80fc9eb77956b5e6206f32c632

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