Malicious PDF — malware analysis report

Static analysis result for SHA-256 9177467c402b7f33…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 19:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 492641c01355470c25ad3654ffdcb859 SHA-1: 10d7e42eab7f4b26dc7df91a5dec1967b8e8c116 SHA-256: 9177467c402b7f33a218c7e85f75e316a3a9dafaaefeb747f9342cca9352efa3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094846d0b080---87816677401.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4ad0ae75efb554fec9e7a3a9146369d6/buguga.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/72202640010.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7cbad9c7---fudapuzuxiborazugigifa.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/zijodoriw.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/g598l9g6kes7lt8rhe1oh3v7df/sawaxijipisexipi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/723f5fbd763a8b319670635b48013a41/92675564856.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/392dbdecd0b57c64b1965f6575662e18/60496444637.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7kqdhdo5i9qh68r74uodivpkv/xibekutas.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160894167d108d---ruvuxet.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rsim2df5d3272kc1r42l73ao83/tuwezoteponegekur.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/suwaji.pdfIn PDF document text
    • https://irantruck.ir/data/file/27953626818.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0r4jkntkl1ridp6docb4c9qhef/nolupelobosisax.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pslifnji4u0h3dhm83lnbhr08f/59729353730.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/59fe7f1d3e23d18be52efdadbf9531f1/28427975734.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/tamisop.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vobvgi90snicp9m6jsoc234sgq/buxijogiresalupu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dugumedusip.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46647540653.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tofagirorinonokefevogu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4d92db4a---nepafes.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac585808025---8603583022.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/68128483017.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/94351097099.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b802d19bc2f---47481800380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=interactive+chess+board+onlinePDF 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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 17012 bytes
SHA-256: 9883941824e48cfc8ea6558cfc5fe13ab0e7596bd89d7ff287150e815918d46b
font_02_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 10624 bytes
SHA-256: 58a827c3b83bdd4bb43757d31efb428a73fa9ddfce799ed83e03a352dc84b59c

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