Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c6b4569ccac7ab…

MALICIOUS

PDF

91.9 KB Created: 2021-07-17 11:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80df0cae516f03b078073287cd26b667 SHA-1: 4954755515ac4edcb5e3599ca6364819e5d7fabe SHA-256: c2c6b4569ccac7ab6c6d28b5a51de0b28f9e18021c384edd6bc7c927600276f1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further payloads or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature, while PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM highlights the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pospatrans.cz/UserFiles/File/dinaliwi.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092446a93830---xajopanelutepobodim.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/buxiriwixofuraxolaw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc6a931dc---98635863089.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/29ote9sdqoeqhjp4l643faub02/madow.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/jepeguwovuvesijosebaneg.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/48614195183.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bujefolategavapuwaxedop.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/93803438443.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/88c8c92d6f8940135063407c95ac193a/77657798152.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/45166283210.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/32553800943.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fogopax.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c97c732967e---vodixipinapow.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/561975d8f69abe3d8105edc82d42fd9a/97246466173.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/68701204727.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f80e11805c79d83f16ba3f02662bc04e/59542719315.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zazulurotedizuraz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6020b60a---kapajutojebelepanezeke.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defbaf3e008---regapiwusibelimaja.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9be135c7---xibosexurububomuj.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dobuzupomimopapekotesoz.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/99410849890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+adobe+premiere+motion+graphicsPDF 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_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 2dac766a880ca68346e3863220123791b89acc9285b45121c77e4a08f0682301
font_02_sfnt_off0001495d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495D 11032 bytes
SHA-256: bb6d807aa2a942bfe03ba1a86326801901476cbdecfab95c47860cdf18cee766

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