Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d9f2915aaefcf8…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 08:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e716feb909b5dbe4c8d968b60786400b SHA-1: 1bbb34c46b7bee6a45374ed02ebc09b3a336a437 SHA-256: a7d9f2915aaefcf82d7e739b25327760e5a47de836ea88eecb2b169ba6d6372c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple links to potentially compromised sites is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.dereformasenalicante.com/archivos/files/68433833230.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/3edb7b97031ef2568410c1b309f647c3/57836583292.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/41002671057.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/877da4ea30fe6dec72ed33522235eb14/kaginojubelejizasonoze.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/22973036753.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/860156c26e1c2a34519ca50f63a9d4b1/pipakotefatevipodug.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/parawewul.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/u00ev6vaeajf04jcq7a0fhmtf5/nenof.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/71603475380.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3ba8b675---jukasowiniruve.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/jezawawen.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826785865a5---36513814809.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/78297614049.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/de4kclffputddn9rgf9dkejf4a/1381023494.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/89075896410.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/buvujobomesodef.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/79581430452.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/23544158358.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/pudojoxipovirosirowipirit.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071007092373499.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/mirudabaxodadakopozonaw.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/badekid.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dugijiguzanasirodexid.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/51998f4adba65daafffd145981050336/6545624354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lily+collins+looks+like+audrey+hepburnPDF 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 18084 bytes
SHA-256: 3ad2f4958a8382c8ff02a711b5a928584684120f599534766ec404b1fda8e135
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 10916 bytes
SHA-256: fb29e6ba8aff1a364c46dbde635fcb4993898dcc323f93ffbec8c3f28ae452b2
font_02_sfnt_off000133db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1