Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfc28ee1cc68972…

MALICIOUS

PDF

73.4 KB Created: 2021-06-26 08:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5583b4f1a30da5f851f82d9558b5e5fc SHA-1: 7405a80092ce38b6904342c676c1c1d2fe237727 SHA-256: 0bfc28ee1cc689720f0c579a9dc976fafdc7bd570e401fa40e0eb10b2da3025e
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g8d59m6onuqietsb5v2o34lle1/piror.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9scgdqrb355tk1llnp88hbq2to/luxajomifudimuwokunela.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3a7d3353---40075892224.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cfdf43f3b6dcf3462ccfbe4b5face214/21875581127.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999ba76542d---96137817113.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f3d1a1dbb0211d4eafbdb6ec2e46915a/21234511112.pdf
    • http://www.kickcommerce.com/userfiles/file/64171745216.pdf
    • http://diversecityuk.com/userfiles/file/24781037616.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082943ea744e---64851702829.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ccd19a38---91710306275.pdf
    • https://fcksa.com/ckfinder/userfiles/files/6148341661.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9167fcf5ba---rebaxofusugaxanasozivijob.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2hvik4shu0u6posliv6umhl7e0/20186750503.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2bdc509b9---4040524200.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7172f2d05dbe9d4c634ca5823d31625a/56774642430.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2e36670c---43679511343.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8vjue14f2q5cqfq65t3leees6n/gofowuvomima.pdf
    • https://ms01bet.net/contents//files/71021333029.pdf
    • http://ledson.ru/upload_picture/40494531871.pdf
    • http://geometrabottero.it/userfiles/files/60087979378.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec319178f428edaf304433ac5e5d6118/84359982585.pdf
    • https://amatnieks.com/pictures/image/35173759409.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca60ead07d---vazowubofexupefirejowiz.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1792o30v4g1asd5jig4d27np76/69218201395.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bab6ef37---rodakiruxaxapidiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=simple+past+exercises+regular+verbs
    • 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_off0000bd51.bin
e01ea77f21495d90ab3e06f13518afd546aa31eee50f9913e9689f0cd24b04c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD51 10976 bytes
font_01_sfnt_off0000d6a2.bin
549385e35ab856c9630c37d56d9dcec952c45504839cf25a04076fe788ceb2a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 15992 bytes
font_02_sfnt_off0000ffe8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16792 bytes