Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c738a85b5c66600…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 12:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a231323eda81ab69c3b1ae46eb797b7 SHA-1: 0924836da96ccb2bf6ed033f0cba0f800e74e6cc SHA-256: 9c738a85b5c66600babee3cf6f5a941045bf6bdd60fc079a19c5276f9a45f013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other domains, suggesting it may be used for phishing or to distribute further malware. The presence of external URI links and the nature of the heuristics suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=gt+racing+game+download+for+pc PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/69fcad9c3f8828b155ba143cb981e382/87632235924.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3812fa51b2d30d7a38aedf0c145dd57f/19012939753.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/62213220396.pdfIn PDF document text
    • http://keitbg.com/images/files/653833449.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jexef.pdfIn PDF document text
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161318a7f49ad7---36231067301.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/59449734471.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a34595a9---tesininefowotewof.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/koligafiguxobezupize.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/fixenazetewatufevarogak.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/66605862125.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/rurogotitosodo.pdfIn PDF document text
    • http://zeci.nl/im/image/kivopamabimu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613faef4328d3---5184623980.pdfIn PDF document text
    • https://sanidom.pl/img/file/gujilofuxataxadesulipivuz.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/64748882552.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/87966610819.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/76125251856.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/70302712415.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/lidazo.pdfIn PDF document text
    • https://membermimpi.com/contents/files/telujozavofalazamog.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vllcs5k4k7r77m2ohrpd9qd3jq/repazapexilos.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe815506f---41287527353.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908145637642.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/44988999523.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17952 bytes
SHA-256: 09247235377cef6ed787484eda1d2e4579ca7aa2c2e0176e3088c9266e4d9243
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 10920 bytes
SHA-256: 5953edb4661a9b908d8d8422487c5379ecde58eb1a2015122527185f2b5bd60d

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