Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4198a85fcbc561a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-14 03:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9fe1de0f8fc98a6603d78d6ff212e26 SHA-1: a83313ec3f789aedff83c0e8a688cba818696fe0 SHA-256: a4198a85fcbc561a290ca1ba75881f12aa6fa570a45c87375c6daa49c6ab7d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The presence of multiple heuristics related to link farms, compromised CMS uploads, and disposable hosting suggests a phishing or redirection scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161363164462dd---15698952567.pdf In PDF document text
    • http://aptekadc.pl/userfiles/userfile/39168467141.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/beguzativufadot.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/mififanirol.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/57637472190.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/6852435384.pdfIn PDF document text
    • https://icbacademy.com/upload/files/5121400363.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/14657811500.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/gojejukitexazebazal.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vetumupuribamaget.pdfIn PDF document text
    • http://zgic.ru/!upload/files/94784807978.pdfIn PDF document text
    • https://go2germany.ru/files/file/8240017822.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/debinik.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/96169203221.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/semuvuze.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa81914ffd---zeguzoz.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17183887524.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2b0c795c---82445499110.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/73009759778.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/63610724376.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec48c26f8---zagitun.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/lexegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hanuman+chalisa+in+english+with+lyricsPDF 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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16548 bytes
SHA-256: 12e61099855c3adc2d9cd5e1816fb4133e8b9d0480a136d11687a56b4d5fac72
font_02_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10848 bytes
SHA-256: 5aa552c21fedf39231e2504bf78fd8a7ec0df88a1c8720bf35be402029cef548
font_03_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 19968 bytes
SHA-256: 1cbc7cb7539b72881c83e7a9d87a2379c940f2370106709a8f9ba206ef58065c

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