Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba9c29166d03e84…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 17:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f678c6e9d4bbbb260e87ec2c95dadec6 SHA-1: 606caaf732f74c6f2cc53e2858586b513f933872 SHA-256: aba9c29166d03e84da4cc08744fee4ece22439fd32651e2289fc03efdf5b59ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links indicate an attempt to lure users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=turn+on+background+app+refresh+android PDF link annotation
    • https://probidjp.com/ckfinder/userfiles/files/20210912_162759.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/77045968452.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/pekowoma.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/korelanabusasexevuxet.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ea26ca1---35893872148.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711b8516f3---55748715061.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/gelaxoxajuxovemufepik.pdfIn PDF document text
    • http://byecook.com/ckupload/files/84377711207.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e11920d0849dfd1ea1839ed61a6b3bef/gamewabobusinusem.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pawizitalejinotemujogi.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/vejajavuxufowopezogumavon.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jisefilorivirupabopawu.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/58653784214.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/17836760633.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141765c4f1db---7125893276.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/vatogamovexufusemilobu.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/nexemu.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_off0000ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC572 14716 bytes
SHA-256: 5672f6f2292dd10424563f3325a6e4b2a801ab64a2fc66363c0935bf45197762
font_02_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 11048 bytes
SHA-256: e6165d5096a3a26245fe40d177d3b190934d3ba453aa6ecb2374a1cb380a2dcc