Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6c277226792ea9…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 22:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d0a419bcf237ce4ac8de6ce0f78379 SHA-1: 16e8f9e3226b475d6ebd26e79fc4e2f548bbc908 SHA-256: eb6c277226792ea94c76fcb6ef1dc884cc64b1ec4afebae88900e5c11c4a8a0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086234e1ddb7---2799231735.pdf
    • http://safetypath.net/cms_images/xazumomawomezorejino.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfcda651a---gopigikumojepevovusojowa.pdf
    • http://abwingsva.com/uploads/files/70698911230.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0ccee98769c7357dba7f4d29d04e4d48/wavamurozixezexotudatig.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da9b7edae---37887791238.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/64fda8e9e9f49aef95cfa5b76c7e0cd5/4328424436.pdf
    • https://inncredel.com/uploads/gimamuzegiz.pdf
    • http://teckim.it/themes/userfiles//files/20686338451.pdf
    • https://ludifrance.fr/userfiles/file/rolopuleredegekuselivi.pdf
    • https://fertilizerproductionprocess.com/d/files/53547854790.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/f98rbkogo5bh6kok4u1aod3lp9/83346341529.pdf
    • https://666666.vn/upload/fck/file/lumonab.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rlqhjnfmqn8h7t4mkh6vo04djv/5350277315.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/22301078f7100ad805b58a99c100ddcc/64010657581.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b23ad99a---95616742375.pdf
    • http://www.pzkexie.com/up_files/file/gagumowugedeletewiwas.pdf
    • http://yuhongzg.com/d/files/57766653772.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8526b1a588---romejumisavebute.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d9feab58---boxiwila.pdf
    • http://vagtteam.dk/userfiles/Files/21401205584.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8e074a3f02ec6f94efb1ed13d573be7a/meduduzegeporedorur.pdf
    • http://technoculture.cz/admin/upload/file/wulobawitoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manchester+to+alghero
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 16792 bytes
font_01_sfnt_off00010302.bin
4e90c0230fd2fb50d9ee41532ebcd8c566591747b6386028bb9cca66f10aeab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 17056 bytes
font_02_sfnt_off00012f70.bin
d64c8c6eec96a691c8f0017435fc3016a891cc1e3bbe78ff85d6c2ae04d6907c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F70 16180 bytes
font_03_sfnt_off00014512.bin
6be41702159d1a252277be922e69eb3e10e100720405b805a2aea4b79162ccba
pdf-font-stream PDF embedded font (sfnt) at offset 0x14512 10412 bytes