Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce07cb80905968d6…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 14:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dee0257acf43e5d36263ee70fb26ecb5 SHA-1: 1a6edbbd75b35e5640672091ccbd8e3b202181ba SHA-256: ce07cb80905968d68c0ead937a035f031da257b33d5637ba5e67e8633209132a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content. The presence of multiple URLs hosted on potentially compromised sites supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adf42dc198e---36274228151.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608def14e4549---kapijuvesirefapodobuwesas.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fe4224bfdcbc86278b983a3d68b2c6aa/nukefazikevebuseluvoxese.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c56249416be---kizisexis.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/liduwaduxedexuwu.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/difun.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/c16cb46e10e6b95da5657ae7f5125d3a/vuravubevasuxu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/5187956415.pdfIn PDF document text
    • http://tipiland.net/upload/file/dagexabede.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b3b45be6---pexikudosukolete.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/luzuwurebamanizolijeta.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160813499de6b8---sivarivemamilijuwemakuga.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c9eed1b3---70281975331.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/lububadavapebefuw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea6d2c12d---66852310056.pdfIn PDF document text
    • https://tl-systems.hu/files/files/88830468317.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/42216210100.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30663326582.pdfIn PDF document text
    • http://garderoba.sk/images/_file/forunibanokoxaji.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/e5h8qmh08l7g6drbh7328algun/54436614204.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/22583016819.pdfIn PDF document text
    • http://beateromer.com/bilder/file/babakunanivi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760923be08---94226816420.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c119f8234ee---vovogonorapug.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fuzal.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ada6b58ebb0148d750764e2610770235/gekunexugasasafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=torrent+assassin%27s+creed+2PDF 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_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 21424 bytes
SHA-256: 077c5e2fc8319d3974b4ca7255ec4ee16ed7ffad0bed8bc4aa8ba265ff1c163e
font_01_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E85 10432 bytes
SHA-256: f7c670bc43895ea8ce79ebc1f3fd716299cc3f3155f9ef3bca4d704a94ed98a4