Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af8ffaabd411b5d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-30 07:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 131894310d38f7c3cc0957d40ca07411 SHA-1: e137725f10ba7450e58d5d11cdc5020ee89d16bb SHA-256: 1af8ffaabd411b5d4be951b5728c976bd49ce60db485c3f543c7c4c5ce2333fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to distribute malware or conduct phishing attacks.

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 https://oniceh.ru/uplcv?utm_term=island+survival+games+online+unblocked PDF link annotation
    • http://szguilong.com/userfiles/files/muzalefuwoveliwuvevabarut.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gexav.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/dadofesesenolosiviv.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/98274988189.pdfIn PDF document text
    • http://ledson.ru/upload_picture/78875085272.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b7844e3c---962436249.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/44a9129f0021ee788e0c7fb8575b80d8/89061170329.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/33778741563.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c112f3145---padute.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/33836165579.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/5223793511.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160912dbae892a---wepixuki.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dda4ccdc3d6162b81b7d9d7f03c52d1a/34865566164.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a86d5edf551df46c09f29809569ac64f/71666555404.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/435a2b298894fdadce8a096ebeb560a4/89756129909.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26ca9e47c507f14db65197ea915b46fb/14641853685.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/jipabekare.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c945a83f36---50655576973.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/33537326567.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ff8b11dc58aa16ca3a3bc6058e1c1d04/wubowinakezudemenibab.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db256a6b3f4---jilub.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/simopopikepovidasejudid.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94119758120.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tukede.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/98b4ae10ea7a52f9a5be371868d45ecb/58018130477.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_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10964 bytes
SHA-256: f674448eb5ace05608e5506d72b3e8d1eb4c1f9579f012d0afca1814943bb3fb
font_01_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 17000 bytes
SHA-256: 591635bdaee81d31279e8a3704c8f739a4fb9452298c2fd0d5d3aff43d2c32b6

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