Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f868faf75c36f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-18 11:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3dd15fa295fa1b31b8a3c6176762920 SHA-1: 27f78c2e7618d5cf190723e1bbf15dc84c59e8c5 SHA-256: df2f868faf75c36f731f47087ec97390378bf29bd01221401affc4d37113eaf1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2ea531c1a87dd9b1fec90580827a6555/fopogekegala.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c038ae95445---pelutakujebulevuf.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/udkta9rcerh0gkmfd8c88u9stm/66350754856.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6711cf3fa---xofiketodipevovejavazoke.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/33q5llsttm7hh056noif6jpvj2/99704486287.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zobogopedabufizam.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/76403487183.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5819879f---28559782464.pdfIn PDF document text
    • http://hotstamping.pl/files/file/mapidukekagibozemuruve.pdfIn PDF document text
    • http://honghuibio.com/d/files/zepozaninesabamusezokaji.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/kuwodotidosuninozesaruk.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/82151803762.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kijedokimixezuxapezed.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/52947607579.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/demasu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5ddbb85003402f4c7e1a40f1846801cf/44601337064.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f0c0647ead4cd682bf2043e66b3610c4/50748461134.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/44353411212.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/46323241382.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/38245424322.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ecb1b22232dfb784657f4b49be619dd/kodexogawipiraju.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/8082195082.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/kekipezekuforog.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f14449a9439---65296222820.pdfIn PDF document text
    • http://acril.ru/ufiles/files/78266191464.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/747cd113a966d55182326744e2cc9e44/tomodimowoxasivoraxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bangladeshi+cinema+songs+telugu+oldPDF 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 17196 bytes
SHA-256: 4e449d479f16339fc3a5e7678c297d71da546132cb1d0f90b09f852470789eed
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 10868 bytes
SHA-256: ae3859dc385df1970b13f55cb2b12bc6bbc98d4c5d78866b451f7a516bd8c955

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