Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b1997a32f1191e…

MALICIOUS

PDF

95.8 KB Created: 2021-07-07 05:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 936cdc805fd4b1d5c890243f9d930437 SHA-1: 8caa13fb83dd45230c34158e0632c39c2063fa7c SHA-256: f9b1997a32f1191e82b6a4b05e48ef38677aa8742db377eb23b0b1d392933084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript, though obfuscated, indicates potential for further malicious actions like downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crewmak.ru/uplcv?utm_term=oxford+maths+book+for+class+6+solutions+pdf PDF link annotation
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/70670104536.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/suxuboluj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v9ic7udk509vvvff493gcd0h02/78927591776.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/61556577518.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1ae9ac12---19561902629.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c010cb45e---36763191083.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2curcjie4h682t00rcr4l0e14p/16915522319.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/gupagese.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f5403625c---7666011342.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/gazapexuwaw.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9cb5457db8710be618594742f5189e4e/rivosivavukisunanamububex.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106030056.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fb2f007f---43279634446.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b782aeea7---90145763368.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/200010ad8a58459d589ebdf901521979/tibasepudisopanivoza.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/zetojuxozisirisawatomik.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/vunofosetizetu.pdfIn PDF document text
    • http://thedreams.cz/files/dodirotejuxegizovu.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tadenedubuxe.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zofuzanebemobogegilapemov.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/71730047718.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/xofimiwixawe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/370b7068dead1dc08716fe3b1f2f2798/xeverojuniwitirex.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r9hb29cufmjjdhi7tonp5onji2/damozajowesi.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/56667354818.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/17787637137.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_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 11380 bytes
SHA-256: b0a19a4a8f9cd4bec2e648673da72b57effb3bcfd1186e506399f653bd3aae93
font_02_sfnt_off0001444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 17796 bytes
SHA-256: 93f5ccf79470112d4af94980e87d9da01a15111173d2367609e13bd16475b997