Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bd0704d90d9773…

MALICIOUS

PDF

93.1 KB Created: 2021-09-19 01:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c46c9f20a93dd18060c94e89dfdef4be SHA-1: 3a2a3e0011737af1fe7cb5d61e397cf950406963 SHA-256: d4bd0704d90d9773d28caa837aca7e48629d9bf951dd3cdbb1b108385a2b9434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress uploads or disposable domains. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery through the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--2o2b17g32e8xisqq.com/userData/board/file/zapinaf.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mf8i3o7uje3j0lmglvhc18ftbo/71190509975.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658a94917a---14301140336.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/tudedipomenuzijonoxi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/demolusalagixezokiwokuvep.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/51809954997.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/fuful.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/lafanuzavaronezikositidak.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/14287558479.pdfIn PDF document text
    • https://grandegroup.net/files/juruku.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/voguxazorifomipire.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/34089531541.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/2704001027.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173146fac5---dabej.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145babe23032---41082788063.pdfIn PDF document text
    • https://drlanda.hu/user/file/mebowikujevikuromer.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/vuvakubexaluza.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abc1a20adc---ligaj.pdfIn PDF document text
    • http://spyboarcams.com/files/nawarimixusesitotav.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/rovigurobat.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zumobopopejefatubi.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/turenafam.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/veseb.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/wumozojon.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/kulaxududiwibofimujixinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=for+the+love+of+funny+sayingsPDF 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_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10752 bytes
SHA-256: 11a41b87fe4d73c3f13325f8e207df084180fcc5bff40ff7296394cdda2829a6
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 19636 bytes
SHA-256: 665242ac3d32f415715da541212a625d11025770bab0bc2a3e195361b93e7b4e