Malicious PDF — malware analysis report

Static analysis result for SHA-256 318de3e71e8983dc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c69177c66217dfd38ac9142b03323d6c SHA-1: 214e01fe9b4c12392247b756b8f8eb8bcac59633 SHA-256: 318de3e71e8983dcf11f8d7df7bc8bee192318ac8e84fedbe24c851804c59cf3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on potentially disposable hosting or compromised CMS uploads. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, a common tactic in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://applexin.com/ttpsea/files/file/fuvoliwidibada.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/keratov.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/55957885028.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/82128174634.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/993889840.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jezikikilusose.pdfIn PDF document text
    • https://topupdana.com/contents/files/67987530351.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/11716689992.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/wusadopezixed.pdfIn PDF document text
    • https://podimercrm.com/img/files/60751032933.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7e66319f6ecf586d8edded3409d4c67/jepimukatemab.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/99645324918.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/lizesetavipabimigor.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/48734190907.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garorinimaduvoworutu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tepupitidunenufuka.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tupuvepepuwavu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd844e336---75112489999.pdfIn PDF document text
    • http://nessium.net/userfiles/file/kusaj.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/41766611763.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/3378735896.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/sawivinokowup.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/babonepuworonux.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161412b85f31af---44677929315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+saved+wifi+password+in+androidPDF 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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10768 bytes
SHA-256: 93eab70750e02b8bf256acbad892e9cdc9b4c48e7163867a443b6c0521dc9863
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 18696 bytes
SHA-256: f27e17de6c0e9b76fb5f3ec63fbf5106e2485dee3d93118de36b031778ecbc90

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