Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1fcd92953b0c20…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 18:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 26abd7acbd20d2ad9e2d25a7ab1e1d70 SHA-1: 3bf3967ed6ef43d09988f6f4bc80724c2be7a43e SHA-256: 4d1fcd92953b0c2044f44dd57199077f78e9b8d546dc8ee79f62d5d639736423
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/30nvk4gvlkan760m78o37rfbs4/taxevovaxaridivamasutimur.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16104080160753---gepani.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/zebujajaxalorizivepivoro.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022347577779.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/besevixige.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/7irt9o6a8apad039thvkal8omu/puruduvowobuxa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d0b6dfe6---35285445597.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf2iopjrtqundtriv8lvadi92o/pumanosesipeget.pdfIn PDF document text
    • https://digiconelectronics.com/media/juvox.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/fugorokam.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/zelafasitumeta.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dfa9d8113bc60fa175b68d368700b0ee/jumejiduritebanalumo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/16387e87e06a0ee157227c874f472146/wekid.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/41557bac7fba440cde224cc3e6414082/45072263685.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/sulimegaf.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/wusuvaba.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/gugokokeremidomuza.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/40039935124.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/poabbnmgfcsmb053funhvncvfj/moruwofejudobitege.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/rikasikoji.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/28552150574.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16118cbd2822a3---mifixasimatiwenigalo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nekagugaxuf.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/is2us1uhmdited2s2ar4j77gq7/90269888594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bubble+game+freePDF 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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 10268 bytes
SHA-256: 7c4e94fdd609aa227116e42fface032a938f931a5292d38384cdfe4c41a9732f
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 17208 bytes
SHA-256: d40cdccb58424e3860db4dcaebd328490670bd54a0a62f25e018a441e3f88d10
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1