Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff831f77c8948666…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 01:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7373ce46aca75096846fb11fbb74a0f SHA-1: b2eb4a96cd087df9fc19a49cf3bcbb5bbfdb1dde SHA-256: ff831f77c89486664f4ad994710a44e7ee57df2fe745f95a1d5deb34e9faba2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution infrastructure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=the+things+they+carried+genre PDF link annotation
    • https://bluetact.com/locktactyuma/userfiles/file/39127312337.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/viwinox.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7882789169.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c09b4ceb4---zapuzefifi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611635942b6d7---75574462619.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff8a5e797---tatewobijopopujedi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/wavegepe.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6d67a145a64f09f6f73d2a0d14d166b/gibikigijorifugaj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ikophi20a981mke8vajjiv0vh6/zazezikopa.pdfIn PDF document text
    • https://mcsfood.com/images/file/makagilodevoxupamozalo.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/benobeguleri.pdfIn PDF document text
    • http://eternaseguros.net/files/files/94435106163.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/4752647701.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pobixefonaxobowetokidix.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b80c1bc684caadf46d6995c780e1b908/lugimipazezo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/mezovugodawotujilalalubab.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16079b15ca74bb---metasataxizadaputar.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a38303e342f---19524330210.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/20030525032.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160845bf52da59---zunojademiliwil.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/miragerun.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/49941675850.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a064e8828b64658ff04314a5838e6775/64295744500.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/312d0cb5e7d8c4bcba873f6b290dd584/remaxomeladivas.pdfIn PDF document text
    • http://temple.mo/userfiles/file/totefoxoxuxunebiva.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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 19752 bytes
SHA-256: 280de8e07e0a80278aba3b5ee849e15e34bbb02093b5b49310c98ced4191c500
font_02_sfnt_off000134b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 10560 bytes
SHA-256: ccd686dd8d9d130e1351302e097d10cd421dab92960b008e8ee3ddfcd07ba6b5

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