Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b50b7ddc73c3a4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 19:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfde375d1c194992ca11a08c797e2f0a SHA-1: 9697fb89f369e5699718ac4e3141d88a9eac29f3 SHA-256: 21b50b7ddc73c3a46a8095d89776c7b7685963a309769af10c57d57dfd590278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links are likely intended to redirect the user to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/tumapiwajiwonikirasotikig.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161414d6de131a---jomopoli.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wasiwutu.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/nuruzabunegadama.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///marosiwenobatikokuduborul.pdfIn PDF document text
    • https://cargobull.cz/res/file/46219441544.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jojiwupagujofo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/065e84db89ec7fccad2ff91f8da09bcc/zuboxodeduril.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kofawuwibitigiwif.pdfIn PDF document text
    • http://land89.com/ckupload/files/47336926081.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zijanefujukokanisotux.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gopasegosov.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
    • https://blogsma.com/files/xenutibenuzitalevoduw.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dixuxinanone.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jevakopasetej.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gozoxufafedamixavajiv.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/47985943650.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jefarikususozo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/wukisexakuxemawufakirot.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/miguzofusalewewuguxaderog.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091823580473499.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/16582268689.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/48972348069.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///83001443874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+stop+force+closing+apps+on+androidPDF 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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 18612 bytes
SHA-256: ab75cbc98ff71e36563801b3afa03eb79d9c577bd40172353fb5292a5bfd1eef
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 10872 bytes
SHA-256: eefc5b949d933b1279dc360620e6bfe6dc9ca2efb65b59e4c0c5923813afe33f
font_02_sfnt_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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