Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e3bdc2a13d9ccb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 13:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a751547ea4a3060124689803ea74695 SHA-1: e230b0464135297c05bd2b1ea6bed312e7fd50c0 SHA-256: 64e3bdc2a13d9ccbabff8ba5300b79002dd220cdf98720b272ae39fd5ca80dc3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics further support its role as a delivery mechanism for potentially harmful content.

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613352141092b---39945313414.pdf In PDF document text
    • https://maintogelonline.info/contents//files/92882186667.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/45225630268.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/86285331556.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af3fc2246---fifomotokajuj.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/bijevusixu.pdfIn PDF document text
    • http://guitarenko.fr/img/files/60740057037.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74908665734.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/7666869151.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77356482800.pdfIn PDF document text
    • http://chinazzjx.com/d/files/56835871904.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/bemosejavedetumif.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/kofisuxew.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087851b205b9---60696816223.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160894e68d4ec5---besavepotemukikukunudo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/josufivi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160930d0848216---feruwur.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/32272675212.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zedigaba.pdfIn PDF document text
    • http://clickvay.com/upload/files/rupitodepez.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca57007b2---nokobunaxafezowugugak.pdfIn PDF document text
    • http://industrialdevices.in/uploads/35805088159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kruppel+engel+answers+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/loduvuxipipunirow.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_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 17152 bytes
SHA-256: df8295cd6c62ae355fbaf3d14f4d0bda38c14324ee5440c3b99c885d9e383bd1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10540 bytes
SHA-256: d410affcbf337a9c562a647bfec2e31572e5058df3d45eb51eb7828e06c0ccbf