Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa355be175bee633…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 23:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc1a05c0e701d954ad8933e9089e1596 SHA-1: dbd6b5cf04f9c26270785c711961a8e1fcbcecea SHA-256: fa355be175bee633b4c4e8e172b4b5091060f4887f00ec70bf8464570a3bb06b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised upload storage locations. These links likely serve as redirects to phishing or malware download sites, as indicated by the ClamAV detection and ML classifier flagging this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dlt-nkp.com/fileupload//file/59084739577.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6b48dbc78d2e11a5deacd23ee3fea910/67364338691.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/50328027864.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/80008119488.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/93345693604.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/sisusenubibozezoliso.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/50661545716.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/27916170860.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfd40a9d7---dafuwilopiz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/67d4f97c17d18e7afb14d39e4d1d0310/58195493944.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/0b827de9c005c3ed58d9d1437a8eecd0/jemolibugigojikumek.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086766a825f9---80604182356.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/votaxu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968d1e64a7---fepidefaterut.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/junaloxanal.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84cb4930608aeaa860a3398ecd89110c/poremesabopuxegodom.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701aa70afe0---87265630892.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210603_004506.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/4pbnk1afbhuu0d6n7a443hljbo/ruxenexefevidekamab.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/26fe742605cb2c4eb528b4d3b50cbea2/rovirizoboforadilegus.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/35002667977.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/5138880274.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bbc4868011e9cb296010025b61a02898/jaduxotikuferakudinego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=days+of+the+week+in+russian+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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 17380 bytes
SHA-256: 2b719b2623b03d3b02c6c6f34457368e836371b002b5c938f403f7ba1d14313c
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10940 bytes
SHA-256: 34ede7bd7c5f157feb6d83fc227dcc6d9ffec01328e1c368cf5c07be57591910
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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