Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41c7e723ecf35a4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 16:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4377050e45b3871ca2257ce386623470 SHA-1: 30d0b22d2adbbedb7d0ed35548f92cabdc4abcfc SHA-256: d41c7e723ecf35a4d3096f53c1277277c3f11d685b58fd75a926d4edcf53ad80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL analysis point to a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://studiosantese.eu/userfiles/files/tuvazaxuvujesaduzepepaj.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kmkaol3n6psrbs1jqb6vdrrv25/vomaporakagebus.pdfIn PDF document text
    • http://sentralperdana.com/file/90221205111.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/bugikifun.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/favoponazunozadijarupa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/33656964807.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/zefifakajesotapitubafev.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/no6rlo02hkj2j16tqiv1qo32l4/43473306090.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/95152738636.pdfIn PDF document text
    • https://efnnma.org/files/file/14442396319.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/47960195478.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134302e1cf17---zidaxuvodadogolo.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/75999499953.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/96601856535.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac1d03f8---92946877924.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/86i6ve5c87m66dpofi695drq26/2394372669.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/javiv.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/vutagawo.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/46079078698.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/gixofibologozojuwakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+3+releasePDF 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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 17168 bytes
SHA-256: bdda5e6f69e78b8250e6ea6055d25bb0768523bd3139aa9578f1dd5490ad2cf3
font_01_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 9996 bytes
SHA-256: ac34ba5181ae10a14fe4a8f8e7dde80e5a5fc0c63234b237a236f3f6c53ef60a