Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be90805aed50448…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 00:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 645106216ff1b7d112598a9c114b3880 SHA-1: fc64007a94d9d6c2d88dc4e4fe5808949017081f SHA-256: 4be90805aed5044881615a88144e08712a34492bf7b8b8a0ba3aef1dfe9fbdce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these malicious links.

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://oniceh.ru/uplcv?utm_term=aot+mod+minecraft+pe PDF link annotation
    • https://arranridingclub.com/fwd_docs/file/katazazu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/96169444211.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pulikab.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/87556724641.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/ninorekuxilisoma.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/99629643162.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilutet.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zuxorozetugopo.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/12338862693.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/13437994306.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/fujiki.pdfIn PDF document text
    • https://tepihtrava.rs/files/85225831670.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-8/20210908195955663753.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/25513222397.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eov8tnpv9smrm9j89glak5d055/sekiwos.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/74449493182.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89e4357bb---20130811222.pdfIn PDF document text
    • http://rts-3.ru/upload/files/dagefezopotudekepofe.pdfIn PDF document text
    • http://ipublicity.cz/data/file/sifenuzafiboxopiwogasura.pdfIn PDF document text
    • https://stormester.no/files/file/91382994737.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zotedisemugibolofobewi.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/xobinu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c70c4dcf6---beriwizofudominexegasipop.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_off0000c149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC149 17168 bytes
SHA-256: b8a256984ccabdb75955acb88e69da776df13f36368a9815e4c8e4fc8ade332e
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10548 bytes
SHA-256: 8eb4bd46e80f756d1865493968caeced93803184bce34a02a69801d560656441
font_02_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1