Malicious PDF — malware analysis report

Static analysis result for SHA-256 9effa23bb06cf8cf…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 23:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e02670f68131461de57a565d24fe381d SHA-1: 7981d604f0d3adf07fef2ebac525d2344fd33b1e SHA-256: 9effa23bb06cf8cfd9962b9f6d4d9cc6f4a372086b2b201533550280fb6a46be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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 https://cructi.ru/uplcv?utm_term=autism+in+adults
    • http://aiswaryamatrimonials.com/fck_uploads/file/96155130685.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/17e55cc1ffc7d5227f80f0fad8f6352c/zukosalata.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/371ml5vp95bg15t0cdoo96g9a1/45922017888.pdf
    • https://bio86.net/fichiers/futimoga.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca91b858a1---zotafilinovogojaz.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e10e7a3bb---21967547671.pdf
    • http://svaz-podnikani.cz/files/file/venasivelib.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a1c0e96c15580e6631de24b9a2eae1c/30189359786.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9dac1917---ledajinarabenojugajideb.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf5a0aac8---jorerezudurasedurusised.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608832febea2c---23482779273.pdf
    • http://lycee-elm.org/userfiles/file/60150519614.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c86f21db---93606978735.pdf
    • https://mumegram.com/userfiles/file/48177292314.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baea76d9342---galisitozibokez.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46bb12ff754d46f5957940166fe42380/samujor.pdf
    • http://s-privod.ru/userfiles/file/45174641352.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5cb92157---kunidifumerapuj.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d16ba727---89764321109.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50f158f47---wojakasidi.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/92426442804.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/gewemedefeduvaxigulap.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333ab43561---xelumizotabowutuwofez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
font_01_sfnt_off0001093f.bin
b32cbaa49979c7bd1eb84e5ec2db42ebf0cc7a8f76f765278a6e454dd595ad72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16872 bytes
font_02_sfnt_off000134e5.bin
4839e0767b65734eb89b9b6a18301be5b6f2de34604d11fdf93074511458c73b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10140 bytes