Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8844e22074dc2c0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 17:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02b52b15fc26be16869efadc99e4514f SHA-1: 0d46ce248dfc724dab6994b63de57511ebd17080 SHA-256: d8844e22074dc2c08ccbf20d380d4e933460338b4ba3939ac3cf57724e5a410c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The presence of a 'Callback phishing phone lure' heuristic further supports the idea that the document is designed to trick users into interacting with malicious content or services. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=online+oxford+english+dictionary+pdf PDF link annotation
    • https://kajariaadsevents.com/admin/uploads/file/dixoxixaxobuzazowigoru.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/37991079738.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/17214144106.pdfIn PDF document text
    • https://citronel.com/userfiles/files/genenuvirutivorife.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf52e8b182---38512956582.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3f91dc6afd69da9a32044631349a300/pupegikap.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/megagur.pdfIn PDF document text
    • http://amandamaitland.com/images/file/28935430892.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/kevodafewojaw.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/50664724442.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161209d3edb9c7---91739544577.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df618b95570---35676723122.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/fikom.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c8dee57---lusesepogoxur.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7ce9607e8db6073e8022d110dcefeae8/mamizuludusurirona.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16277896029497.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0b5db15e---17781501810.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/sidexafudutidisomalosid.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a08f029f560---kavodaxetejaporufajenajit.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/93589111596.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/99073109476.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076267e9cea8---seximanasowibuboje.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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 18596 bytes
SHA-256: 2984df170d5cbb1ef23fb77863f6a338542b4679d686329d2a66e70a4e9efe59
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 11140 bytes
SHA-256: 51ff115ef7c5f93eea5aeb270405208e81e6efd51cc08b8d9ca2dabf5dcf9ab0

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