Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1007edf2c3d656…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 11:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e01e08a24759acc329d7c4a21011e74a SHA-1: 7d831e8e3f512f8fad51c679e0ccf38c9fdfa508 SHA-256: de1007edf2c3d656a455f317dbdb74c46082658f3b7e7803315f2d84c1d86ad1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c324a22d3---391812771.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c80db9e0---duvomowik.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///16480221707.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/maneropujepirimexuwosix.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/bolij.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7587ebc3---44318818878.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd8a3bbf---wexet.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c18f4cadc9194b4f551d6175c7b41fd7/musawulamulovilidiji.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f083eaf8f8---93439788004.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0881bcea92fb67e2ae8ab23d69c480d1/pedomov.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f374ea95abc0437b8afa98b00f327d8/pezegewavaragakoratob.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b41556d9---26435329203.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608266ee0a043---8270835577.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/tudibevu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8nm6b6a09hvtsilh50uaokg441/lijobadidazezip.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/52521132972.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/sulomufobum.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/42182748759.pdfIn PDF document text
    • https://birudongker.com/contents//files/dimoxoxadamogisurewor.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/00vdad7vi4fh6e860q903s6ba0/69335280583.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096723bdad97---gakiromufebumabum.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/rarosovidefifuti.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/13685104418.pdfIn PDF document text
    • http://annabarons.lv/files/files/gidix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=payphone+chords+ukulele+pdfPDF 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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 10836 bytes
SHA-256: 5785bcb9704e6fcb3bacc0d6f650c69c77396afeddfcc5f7a1afcb0c48a1a9a3
font_02_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 19256 bytes
SHA-256: 6ef5af584551538ca1457a613c8386745b0ff625014ebe790f2304c41b6f8d0a

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