Malicious PDF — malware analysis report

Static analysis result for SHA-256 589b6dceda9f9667…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 06:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5b73202d760483f8823dfd5b0648f38 SHA-1: c6b7c7309b914559959151c03f3968e792a808e0 SHA-256: 589b6dceda9f96671b82ba09041a9307d0bfe030c1428d3a4fee9d3c4af68cb6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution point. Several URLs point to compromised WordPress installations, indicating a technique to host malicious files or redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a3402e59f---dufurojofoniguvezum.pdf In PDF document text
    • http://jikaramen.com/uploads/files/fuvugipidimajot.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/81574951077.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/7957822152.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d8b4c540---81594386943.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/48099555353.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd3a09841---76555993518.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/i6n2a559gh3386g2if1td1p8nu/zakuferas.pdfIn PDF document text
    • https://anup.bo/images/files/xetevulububukefedolotu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9c99b1bffb58aeefce6adb01fc925290/74189490977.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfdfe821c---sukivoza.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/49560793260.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/migerukajezufikuje.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/37ce471b2849acdf06c70af3daa1c0ae/fetuxinopisexi.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/90699842673.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/babapififufisa.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/81087142767.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/fupijuxalokagonefi.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sutitedixidenoziluvarizi.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/werukolelimigugagagog.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/nakavurajovovoferen.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36513528759.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a6bdcc8cf---ragipi.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/zofesojazefedudije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=handbook+of+technical+textiles+pdf+free+downloadPDF 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_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11128 bytes
SHA-256: 47bf1ea9effdc11df94e03cc81e5d67cb3dfeb265dcb4ffb04804faaad70697a
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 18836 bytes
SHA-256: 2a16568d41d7a510c6424da8a00d39a5f26815d83a32c70d945c4ecfae4caad7
font_02_sfnt_off000145f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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