Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dba7418fd52f51…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 04:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45fc5909f63ca83d0692ca02d1a9df41 SHA-1: 88206e87cb89485b88b5c0bfa5fe5aca1d7f8d69 SHA-256: 58dba7418fd52f5192ae42e262d464ea1f204bef35273e539bcd1f4190d20cf0
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous URLs pointing to compromised WordPress upload directories, indicating it functions as a link farm. These links are likely intended to lure users to malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758ad428473---lupigigejefubatabarazez.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ed5666a0---zefiwelezu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0e99ef27---30820442169.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6a57a12020900b22e74a5555b7f056e7/xapolimetokumopupe.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e702d57afd421e007f8cbc334b48adf7/sojeduvepumiti.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kukom.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/36139535281.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab323405fdf---46944819585.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/dufekupubepotepuxav.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/04831edec5972c2dc6034bc97ed4c89e/66119626051.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a8576bb---jepifulurolag.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/gomomumowenedesobikavokok.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lumusodutaxosete.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/taduxija.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/45066946414.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba910dbc0eb---domidelulazabobom.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/tetafopewajabenip.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fd83351eb9715e602546e86ccc186506/91236949878.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0qqi3cf3orjgh3h8bduh657eb2/41022892322.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/56160979069.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xutopanewofubuvin.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/35802403729.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/xutemuvonebijarisabev.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/33510846956.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f5de86163e043c5b1eb5a931e8924786/lovifedura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chemical+reactions+study+guidePDF 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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 11060 bytes
SHA-256: fa890c97271fb2a42f7204aaa34014fc371efff7ca1ec5431c214aa67b7559d6
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 16824 bytes
SHA-256: 111c4222f3fd917f39bc91bbc2cf2b9d6100c0c07735d1977c60a2e573036a04
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1