Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b0e1e1bd7a8320…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 23:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f01dbfad4c543b1622af7c3293775b2 SHA-1: a5872e35dfe7635acd078bd77635c0ba58c1e988 SHA-256: 33b0e1e1bd7a83206cca43939ce7155e40e7ae25b56bd931a6733d0070bb49f6
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malicious content or lead users to phishing pages. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=column+chromatography+is+used+in+separation+of PDF link annotation
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b47f3e16d---90566859137.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/tedobugededavazuw.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/haossef7ha9m2e4iji9km9h132/12626456022.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/gizusewiruludaki.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231121347372.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/12878876572.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8428abeda4---tifalemojukaxexozaxijila.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e27dd2d077c9547e3f41467df999f4b7/dafobedodewawegudogomo.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/7741150254.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/03453fc19e97c2a0d3275611dcbba310/xiribezedofipavite.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c117d420b1b---bojobixasajoret.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d0780c69---jinafixozob.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a503b272---pasudolusosirixozipemuto.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d096131bdab8c5e487c05838e27e0cd5/givezumaxogofevikabebu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e7385f16153c4db88be509b646d499ec/55825243799.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a7fcb92f---61968083400.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/vuvebuzewarun.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cuc6g57r4jgc30hmapd6c5ea4j/96371010551.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b0476c965d7---vodoj.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vaber.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/bagowizorus.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ee9b07cfb310cbd4c528b25b6420ed4/jojufufakemowezuwejokulo.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_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 11312 bytes
SHA-256: f614b327efbccc85bde8cec7f463b4d125f9f2efca6bee6c724436ef11d9381f
font_02_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 16868 bytes
SHA-256: 0ce4e99c648d9b3a701f63ff5456ca1ec0cb4d8c07ecc32189d7203f8d133f7b

Open this report in the interactive analyzer, or submit your own file for analysis.