Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e4a68c1223661…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 15:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad96eff1eebd7074122f88cbac072be8 SHA-1: 1666ebd8eede0899f931b2e258f64a7866da8cc7 SHA-256: a33e4a68c122366164cda87aad915c19ef4df51139b24a45836076384e9fe5ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and compromised CMS upload links indicates a deliberate attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://coretry.ru/uplcv?utm_term=chevy+trailblazer+2002+manual PDF link annotation
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/99226059407.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/kawisatejezovupilibam.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/95226226999.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974b3665a39---sulaguvovaxatefu.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/xelatopovab.pdfIn PDF document text
    • http://stasta.com/userfiles/file/59684952320.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/repade.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160774ada0dcb0---29256415868.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/h39n5p240umnrqudc72doql7kh/metel.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a150177d---98637355641.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/kaniseviwumoworujelusesar.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a2c9c2b830565fdde19be61288b7edde/43140377033.pdfIn PDF document text
    • http://ezibra.pl/upload//file/wexesepafaw.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/dapapuvaxaxelobomalidu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fd71f9c6f1db4fe12e39c869133a0a7/7736067826.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/nomunaxexolinilitepif.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/sofomemefexi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebcf79ada---xikubojimal.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/77978112103.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff57915fd---29308247432.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/diwefanejimur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f1b64f629---69513141434.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18328162585.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/3756443177.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/dckomvi2082ccu6niipndb7h45/napugasege.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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 10836 bytes
SHA-256: 5cd55770d8fc1e806cb5f45d561707c3ce3a21e28b9efe091d696fb02319d554
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 17408 bytes
SHA-256: 91aa4c05ff6137ead7ff8f3972666cb3d6fa9b36fe529c126ff3986aae6b6ad4

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