Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c90cb0dc34378f8…

MALICIOUS

PDF

93.6 KB Created: 2021-09-06 08:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85e3a3cc466657ce5043e63fa70ba366 SHA-1: b00b54bb3476c276b9990daf622edcb7d885046b SHA-256: 9c90cb0dc34378f80f5703c8906d29b1cefd9f1ad4cc18b9274febc9730353f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the use of compromised web infrastructure to host these links. No scripts were extracted, but the primary attack pattern involves redirecting users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=misys+tiger+manual PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba095b71cf---pomikadug.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2fa48da5d---27934290390.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixesalev.pdfIn PDF document text
    • http://freewest.at/senupuvekerodadujep.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/21088195436.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pujumobezeni.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/f604575f82808b2efbae01687d767c6b/70945465997.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/bejowanepekalife.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/23229c70b086da7f2352fb514d2da87c/52703315713.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/325394b2fdc053d4c8a41e92f7d4c40d/rinefageruxixarafuxapa.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/69982861083.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/ludotamaxobi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522115501303.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d45589e567---11652453308.pdfIn PDF document text
    • http://esejsc.com/upload/files/dojagasotasajisipujaj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16120261653124---50428324506.pdfIn PDF document text
    • http://clingac.es/d/files/kisavegifepufukameto.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/bebejogi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/aoekh060emopjrplkajl1cenpm/nexalenewijiz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5409542f9---66087854684.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a086b10ebf7---96276955200.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/sulowemoke.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fgjd4g12cu2srk6c7r1vesiel1/fidexot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1b4e8e7c5---546820911.pdfIn PDF document text
    • 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_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 10536 bytes
SHA-256: 565e84784448269e0d4d065b54e7032933635ca8e7f6b5533762e38a69f3a335
font_01_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 17808 bytes
SHA-256: 2fdff9d2fe26ee9d04cd0b605d84baf979bb6e2eddcd1b95249628d36b88d373
font_02_sfnt_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.