Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bca58ae79a7abc7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 02:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44cfaff5da5fb8b10edb6f6a203bb7bc SHA-1: e254d263dc926ab26076e0a24c04ac65aeba04df SHA-256: 2bca58ae79a7abc70da8b6b411d58d108915269eb79148f6ee29bc843571c301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/459280f83272e806424dd01e90e70ad4/60805667115.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f066c0529---30138551351.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/50867735529.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d697736053a---6745753293.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4e0459a810f7460fd5d872c16fbf0f9a/lidanejuvekigebetilej.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d497c19d1---zegexa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6fc92826---vakubunij.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f430bd48c89aad875862b3e0ce1b8e94/fupodowufo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e552f0845---pokaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9841f2fe5f---61152269758.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/70320486287.pdfIn PDF document text
    • http://synphabase.ch/upload/file/12062707679.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c59aba14b02---peginajivadiletobibema.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846305dfb99---36882684900.pdfIn PDF document text
    • http://iccarrentals.com/files/file/guluxakilexubap.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/rezixefugefojaro.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/lorogalopobituzu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/521t058srrd703g85ik3tdqcb1/mediwumafopebipetunupode.pdfIn PDF document text
    • http://inncredel.com/uploads/vujudosokinupejetijezifuz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13121758259.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/monalo.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/53072692887.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/51220535403.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5319383314.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c096a90d16c14e308f42b8396a0be632/fajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bacteria+structure+and+function+pdfPDF 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_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 10720 bytes
SHA-256: 815a4101b74cb5ffae55b33a2bddeafa6c2e3a248392854641ff12f3be4b7901
font_01_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 16008 bytes
SHA-256: 45ab25616b88148bdaade5032143f981317b217fee5463ac28609ef191dd3a83
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1