Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bca7c5e77fb1d2e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 10:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72915f34a89a13104ecc1ad635c4004c SHA-1: 751949404cb142e4bb0701cc28cb1abbb6ff340c SHA-256: 1bca7c5e77fb1d2ea1bc98763b8112d3a2a455e4b9e2442dbb43a100fda7c5d6
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically identified as a phishing trojan. Heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting sites. The embedded URLs and link farm structure suggest an attempt to trick users into downloading further malicious content or visiting phishing sites.

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 http://evohome.pl/userfiles/file/lugukajepagipefax.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/31886480029.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/94950792451.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/58775664439.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/pebanu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fazuzanudawefowiluxiwar.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8748c394---riviviragejafafib.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/zopojifijuxisa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9a73a846---bowefoxij.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/45523184636.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6b1b6dfa615d572858cfa69512285799/fojitanagagaf.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/47941637680.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sufaganisiruzudegituvobe.pdfIn PDF document text
    • http://mesterek.net/tmp/73455951662.pdfIn PDF document text
    • http://juentai.com/userfiles/files/refojililun.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/68877940213.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/72f854a03cd8b6fd2113edefa147be4b/43240552383.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xumivufu.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/weralorubetagekojekava.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176ce3f92b---rizixabuziwubametilexixo.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/13934604681.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/49206400011.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/detokosepi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/tatasawukexutuxo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6b66b7b841c6b764aafbf1a5d456377a/68435655821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=moca+score+pdfPDF 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_off0000bd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD30 16224 bytes
SHA-256: 0d878482f554b31c186eead566431a047fc1744f97949b52b16533501f797392
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10268 bytes
SHA-256: 83c56f0310576c8d57e7fe07b89e2a3d1b7cea1ed0e5d13fa1d817303036f27d
font_02_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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