Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e55b6dcd802f1a…

MALICIOUS

PDF

86.6 KB Created: 2021-08-05 17:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5cf57434f9fc0fa49f155be81b7886d SHA-1: ad4f8b07d85fa187613c1aebcf1632c0da6755bc SHA-256: 63e55b6dcd802f1ac0bde8edba192397857a680eaa4900b5d1432747d90cf7b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a high number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of malicious URL distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://laborke.ru/uplcv?utm_term=how+to+use+a+small+air+fryer PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7e622e45e32165d9f477e5b41db38a64/naperasesezelekewibutif.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806243d0ee9---85292762921.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/mepebigezivifej.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82980100435.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210801183602.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bg7f73l0126bqnm3r4n6k47ttv/waxana.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/daduraj.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5bcd2a13---zewafapinoleperus.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/16437823778.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f00662c40---92840187450.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/mrv0m4qft3roihgeb0kd7et7h6/gifofe.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/97492868669.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f953df992c80dd7a5481f15a225b62e8/sekaro.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57e9cdb07---39208057056.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/silapilipobinujovorosewi.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/nolagibu.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/39607818322.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/541enlfv6ari8dgf7e9o6dcrpv/63022110428.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/95536318679.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/31178539187.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/vodazezuzugugulof.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/64421022305.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/74486421027.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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10564 bytes
SHA-256: 78b812c42b1c032d37650a65b5cd09b97df822777d8958fdd43765f0544ed7a8
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 17240 bytes
SHA-256: c97f1f0f55cc26fba543112d3f0cdcfae092bb2daedf67f65555bdcc2687593c

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