Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb04e5f6ff48106…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84997c08d6b5896611979c608145c941 SHA-1: ab149f80d04032c0ea0b5c0084e19df9585f6516 SHA-256: dcb04e5f6ff4810641d7aaf6f1917f82e47e00b31e26c3c85ba1d98403f5d755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine results for malicious purposes. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://siamsankyo.com/Uploads/file/gufux.pdf In PDF document text
    • https://kurek-rowery.pl/user_pict/file/fibux.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/11286342790.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/253e6a71bd9abb685da1b1999fa6220c/sofupenusomu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/pasafejaruravezekowin.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/92782552171.pdfIn PDF document text
    • http://gespk.com/userfiles/file/tagiderusosaril.pdfIn PDF document text
    • https://langumeistras.lt/i/File/83947105969.pdfIn PDF document text
    • http://vuason.vn/upload/files/xaletedunegetinogumo.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/zorugafuxituniju.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c264a1eb4c---zudagowomajaniputowow.pdfIn PDF document text
    • https://rinducm1.com/contents/files/83439204803.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/68433400266.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xolunanosuxoxebag.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/9198546914.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bolejazorubejemisasatur.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614302358614b---36758850714.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491901884e4---89248255925.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/51135280315.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914090854330919.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/taxilomitovovev.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/gazebuma.pdfIn PDF document text
    • http://xfswchem.com/upload/files/kozokivenog.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/54697938329.pdfIn PDF document text
    • http://kccmaul.com/files/files/88148860209.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8e4a2c863841da1a3a94ae0bc061d24a/nafafakazup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fnaf+world+mobile+download+iosPDF 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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 16972 bytes
SHA-256: 46b58ae7195176bc768b7b14395c3976096cb6bf19a6694fe12592bea5ec75fb
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10620 bytes
SHA-256: b879e6eb9aff82382711c52c97bdc4524790a6f3a1c9a4375cf68e6d430334e2
font_02_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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