Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fa3dc680646294…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e3d40cc5456af743bc23a2c06fd53f7 SHA-1: e73a1a8f2750e2d5e589120007e7a9f2a8d06cac SHA-256: a8fa3dc6806462949a2fa153380082d274835eb899bd84b5801983226d02e885
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laurallo.com/ckfinder/userfiles/files/28419595536.pdf In PDF document text
    • https://ksboutlet.com/file/files/pufizifujaxuzekawimos.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/toborujajuzivabevokuparur.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/melqf7ol5lmtdfu3gal3pr4u21/86225812164.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab9533d7b---3545432309.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/zepuwomowowejenipobedelan.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e02b211e---kotudajuba.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/zamixomikapojed.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cbcaf0c0931506ac594cd62342158692/15689902460.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/13027861398.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/rurozoniwa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614403c7d90e1---288404636.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/difupojoroj.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/41959198667.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614eedbb0b14b---79865102208.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/zuzidabelukekiloj.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/98055200203.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/sejerototefisetegasuwo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/8afd8e51d712425f307c5317b6e7fef2.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/92718145460.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/dijowoguvev.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909230853492031.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/73111354111.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/tusiwibatixute.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4ebc28803b674364e720e3fc9c368b17/nuruwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=xcom+enemy+within+androidPDF 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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 15816 bytes
SHA-256: be8212acb886684abd331a244a9f882229a6c133e8e50c62dbf7070b26323f17
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10628 bytes
SHA-256: 42d0accbd340ca9ffc1d0ec9980f0a961f4defc85a7483a050170fbacba7a43a
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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