Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4061f94dbc07e4f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 23:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1401a4b5e2b68b059569f26ff0edeb96 SHA-1: 6b4d342ccbf973dce3f16c246f8af563c6a41693 SHA-256: d4061f94dbc07e4f30475304c975e0a2611040fe223bc944b373666b3feda8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites and disguised as downloadable files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to distribute content, likely malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://beautifulhairstore.com/upload/files/xepenekukifafivuvixasut.pdf In PDF document text
    • http://htbestcomputer.com/media/ftp/file/kaparuzomigogukalotix.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309818791165398172.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/68616571826.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/fipexunepud.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/10785287046.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nokadagaxeruvol.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a6438e2c---50872547214.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/noloter.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/41677515214.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/30253757643.pdfIn PDF document text
    • http://topp.pl/_topp/file/kajaxogazebagoxijefedum.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dabizaf.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3ca606203cdb640f9297b8cfe47c3f20/jidawuxalovatibugugamer.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nufikelaj.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/43805191203.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c845bd6c1---sumalopobomakoligunif.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/bumelijodokaloto.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4066de1---tenudiragum.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77604106229.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/garatowosofoz.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/75551401060.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/55959760494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=toon+app+mod+apk+no+watermarkPDF link annotation
    • 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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 10388 bytes
SHA-256: 3fc25a2cf17479ddf7bc5b9daf3111c55c1ca3c2b0488ef588b1be2b5e4bc1a1
font_02_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 17056 bytes
SHA-256: dac9aef361345f6f5eb150f98567682b094bcf2682de5500ddfbd73f4696c2c5

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