Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de76098118896c5…

MALICIOUS

PDF

80.1 KB Created: 2021-07-17 03:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bc7ba70d6286c71ef18819d3a11ddd0 SHA-1: dc0d2c17a5a6a74162784b3794fd8618c2911fc5 SHA-256: 1de76098118896c5249bdaa0be0a9ec33d83b0e348c9cfc2f030c29888712da4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, a common tactic for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting and potentially a compromised CMS upload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cecf5404c---fivufenodejojota.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f66659bc5f3a2afbf03e5dcd6da85c03/75091395385.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910cab085cf---maridogo.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebe7b97e3---28512804435.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bk7i6s5smi8hl07n3b9uuupi36/zixefinusomixa.pdf
    • http://pileshoppen.dk/userfiles/file/mupebujewizuwapo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/61e72d5abf1247752601e020b831e475/basiritumevufepixisiv.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/77943692512.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2ku1kj4auaem6r7cd7sevqfmje/15438627744.pdf
    • https://finatwork.com/userfiles/file/93486584412.pdf
    • https://oklogistic.lv/upload/file/gidamoxopojofe.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a81912fa3---wamado.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1906384705effe55eea53cc90290cb56/92497226187.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2ce1d8c7---fuwizezazulafig.pdf
    • http://pitchdecor-construction.com/user_img/files/ferarezalub.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf873b28---34919120116.pdf
    • http://frezerovka.by/images/fxeditor/file/54244285544.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/865f9f45ca5f42e6f64b32c57e30c7c3/49157563783.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/98812289896.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/444bb1ee787bafe92fc034cfcbd06d8d/wumiganoxexowurezobukekug.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cf37aaac8b025313fe95639e34a656d5/pamasonagofitevomokodud.pdf
    • https://sharadsangam.org/UserFilesTwo/file/pokapogisewekixifubobuxek.pdf
    • https://vildmarksjagt.dk/userfiles/file/56400616524.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/5f712b63ed57cc16bd73e62797d759fa/71556293891.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d235644b71f---22363196138.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=linkers+and+connectors+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68f.bin
1b9b1bbd345b0009d5c2a6827dfdfe6e14db69537933279e64a01049cc0012bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 10616 bytes
font_01_sfnt_off0000eef1.bin
a5299ff5d782a1c09f2b2ef3a3b8b896acc0d007f1907259800f5292f660ec64
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16880 bytes
font_02_sfnt_off00011b0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes