Malicious PDF — malware analysis report

Static analysis result for SHA-256 186f4bacb70a28c8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 16:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d548a3c4ef86fb7ebf5896580d641b14 SHA-1: daffa7556b763bd0f089db3014e9f8f1c94d0f92 SHA-256: 186f4bacb70a28c8a277f1bd68e43262be5d0ac7e15497b1a51615db39299465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites, likely to facilitate the download of further malicious content. The presence of external URIs and link farms on compromised CMS uploads suggests an attempt to disguise malicious downloads as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=marathi+books+download+pdf+free PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1141858a5d9ac2ca968e25d424c037bb/fabajodigojeseloruse.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130517451599---mofusimujomisek.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/61605139947.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/79379829766.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3ffe612846bc3436f1588d9f8812ce5c/29530771341.pdfIn PDF document text
    • https://hoavily.com/uploads/files/61832374336.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/mojasul.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609defeb889d2---74748422926.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/vuxogadituzasixos.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0ad6e232---fisofixikalojupojuk.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7b28ca143dfd1e785941c3f920acecc0/55213748332.pdfIn PDF document text
    • http://coffee33.ru/archive/file/serurijilelazet.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/69213730010.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/13965302173.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/42676144776.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b62eda67ddb---duliwujajizoxum.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/72321800426.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/40081363215.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3bb99f34---tivakurenelosabuwugigagos.pdfIn PDF document text
    • http://bjjiffy.com/upload/zojelidewatamukiwejutob.pdfIn PDF document text
    • http://safetruck.gr/images/file/veruxepunorepevojodi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a80d6a4f---89919346161.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/slhla7mge2ufv79qp3mt9kqhsv/xiruxev.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e62506a299b---62731966318.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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 10904 bytes
SHA-256: 686a2e036743c002a9de5c85a63054d12331ed305befbbcfa0ece9bc4223e563
font_01_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 17280 bytes
SHA-256: 7b88ca7104315619c3064757253f1383e3618704827d9d7bcced5513e8c3b5f8

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