Malicious PDF — malware analysis report

Static analysis result for SHA-256 04113ac0972e6e58…

MALICIOUS

PDF

78.2 KB Created: 2021-07-16 22:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73a81ecda4e393d8e6f4f99e5857a9be SHA-1: 3bddafbbd16b0302f817abbdf12b2f622960e72f SHA-256: 04113ac0972e6e585a07369da810738e4a93d226aab15a1fc05e25e42bdaae96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b87db11e2---35256864950.pdf
    • http://nfrostov.ru/upload/files/28961230593.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jc93kjhbs0np984tthmrp1chm3/72283451097.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4385a6410---dabaweluwusinapu.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/20246746565.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/eabd81682baa1a9fc8f79c2894bc7317/4482500094.pdf
    • https://festival-bg.com/media/ckuploads/files/liwubakomiveso.pdf
    • https://cartolmania.it/file/47771729434.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa727c19d4b---duvezo.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/digafid.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hg80k8ltjl1kj0677kshtm41jj/17793431255.pdf
    • http://acecaalcoy.com/userfiles/file/28496385246.pdf
    • https://cytairtool.com/test/userfiles/file/20210620_5fccb.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/59455771029.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19040e5c7---pizesiviko.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/6586676231.pdf
    • http://stattus.com/assets/file/63667890045.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b70c00f94f39c69a0c816aefbbd9d3aa/16475979802.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c1411f498781240b3bdbe874085a613/66288781893.pdf
    • http://dolphinegypt.net/userfiles/file/82510125718.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/245361db9eab214102b6b0383c815468/46166624397.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/becq69cr0ifafeuar0iu8vphpn/12593381178.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160819bf64b876---4290430766.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0bda742e48cd0f0413b066cdc9430c0d/67592800281.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=family+guy+back+to+the+multiverse+game
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
font_01_sfnt_off0000e2c1.bin
592c288add8a9bb8aacf48131db4527ca1215daafdf1fb587718f1079798afd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 11064 bytes
font_02_sfnt_off0000fc93.bin
a334b1237f6f71c0eebcfcd5741189a90d8de2cd2e1acf9da5205770f2038469
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 17832 bytes