Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cb58b582c55c4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 06:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea4bed305a18aa7e60604ac3e38059e3 SHA-1: 4c82036e2aab533d00dbb0291424cc14c4688a79 SHA-256: a67cb58b582c55c4b94fc69da19a9c2c2469dfd47a08acbede5edcf84dff8681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=speed+post+tracking+patna PDF link annotation
    • http://aescantabria.es/upload/fckeditor/file///57439617734.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/30544701325.pdfIn PDF document text
    • http://ymmicro.com/files/files/31496723598.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161324151b7989---6825169865.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/g36fkkdelrq2jf4eojedjlkoq0/28889684694.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kizufemubo.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/bogerifuburupurunezigemaf.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/55211890480.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/6539934931.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/25476234752.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kirag.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/52133995097.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/73242052456.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210905225427.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210903_231300.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/82308995028.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/saxepinojupuzezipapinape.pdfIn PDF document text
    • http://rotang.net/userfiles/file/18307267946.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67048707537.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/30578399193.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/38564901636.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7673db5f173de797f266736cc7b440ce/mukumususakolatisuka.pdfIn PDF document text
    • http://kezmosas.hu/files/file/tenufapanaruxipono.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210910110705.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/54018611482.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/94893973551.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_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 14808 bytes
SHA-256: 4d9622bb6be876f3d04d6e5069817956fb3b44ba4631e32feb998a2d34e3d67c
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10812 bytes
SHA-256: a7dc186a1ebb721b951e0010223d04170941af31d14137059fc0920b8fe0ece1
font_02_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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