Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec979860f9ed99c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 13:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6c488a243af827197a2a48175beb75b SHA-1: 4b25d948d522b34e9ac4523cb09b5ccf1f744c77 SHA-256: dec979860f9ed99c5f992e2617e0645c125e9b0f7a4cb8d098865e53ffc92c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate malicious destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://serrechevalier-skifun.com/imagesfile/zazanugamamefikonun.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f97330959---60399871967.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nubufobajefiditexoxet.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/38124734036.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ef05f66c---derot.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/33366828364.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/liwanegikurigusuz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160841ace44bb1---65345145079.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f99ca548bc0---zizogaxijivefuma.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/523c825d02d73e311786be1b2714d8e0/63122018677.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d536ddf82---94210987361.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bce79b48---67853340933.pdfIn PDF document text
    • http://dfanchem.com/upload/files/85041778831.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/55589367910.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/47472501232.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/32203859773.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/84110205123.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/34618215950.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/28527409286.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/98109768242.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928e622174e---33375263889.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254ff52951c---dikurodorane.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/44d4d420215f8d066d849d964cfda6d8/zaxuxuxi.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/93624341080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=competition+success+review+year+book+2019+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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 11828 bytes
SHA-256: 00a86b2767a25eeddc7b3042dd0dd2976f186ef04ad81f639361c81c98c94009
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 16820 bytes
SHA-256: 28f5f4e7bbb2a0443bc0fde60ee62bda4a064004c06e3ddc124e1e53ea613216

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