Malicious PDF — malware analysis report

Static analysis result for SHA-256 2072b58ca6005c5b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 00:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 042bce7eb7b8331b9dcbb4dd6db8d959 SHA-1: ae7184772925030c8fda20d16ad620bd9b65bcf2 SHA-256: 2072b58ca6005c5b19ba57a23ae34b8e66872ed0d25825ad244c273c9ac36821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, including one hosted on opalbiosciences.com. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bd7d026---85050792790.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdfIn PDF document text
    • http://suurelepa.ee/data/file/molatujufajurunabibezuzu.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/xodedadebub.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16166f6c3---jalikudebos.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021918145137591.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/dujakibexomulinasekonijaw.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/39167037229.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/giruw.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xujibel.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/funufezuwaroxum.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/94307147178.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/desakosinidogobokuriz.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/7543894549.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3d1e91b8---jeletutuxolol.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/32245358430.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/zojizimubiguduvafalajejup.pdfIn PDF document text
    • http://schubert-hh.de/image/file/falozagadiso.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/fawafowewegarojagav.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/90258184194.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38067771614.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/10478231590.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409bc55895d---12758869702.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/90537753124.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/18185690609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+take+a+screenshot+on+my+mobile+phonePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xazefedejeg.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 11200 bytes
SHA-256: 6f8a4fa4471063561413984eba6667736a9429959587ed058cf7e6165a5d1a64
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 17356 bytes
SHA-256: ab1afe8a61f8d7dc15fe4433e17d6a5ec2d55f971f61dc1dfa71974d08dd9437

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