Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc20bdac74b9767b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 07:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd5ce4499ffdf18324f621e0085ea0e1 SHA-1: 8ffd39e08c667c8cd0bdd7930a6210a2905ce508 SHA-256: fc20bdac74b9767bff36aca28f281d80c2632920a7297496cb2b63446bcbb389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings and URL analysis point to a pattern of using compromised CMS uploads for hosting malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b45ee7d0---jakaguk.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hvk1ertv66hcgh0v3tfivn0opg/55276953143.pdf
    • https://daquin-ferriere.fr/userfiles/file/sugiladefobivubiwonudebu.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c6bf9e3c6c03855b0e5122b7b1f2d69e/54975052980.pdf
    • http://uniroll.pl/user_images/file/30457786994.pdf
    • http://ttlh.vn/storage/ckfinder/files/1476257306.pdf
    • http://psycare-spb.com/userfiles/file/madupagiwozowunodegezabon.pdf
    • http://stinpo.com/ckfinder/userfiles/files/nileworuwanovuzegusopu.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/48366628836.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/87d11c4d8a61bb969470ce4b8fdd2f32/vidaridopa.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/28a56d496b1f90ac4b73eee1aee11f94/velelezojoji.pdf
    • https://f27szerviz.hu/upload/files/lufemeluforebomezofalet.pdf
    • https://serwisnawigacji.pl/userfiles/file/lavonobakemonefirokofip.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c14190650---remibibosefu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7551d0e98c---jipefuvikuvojijibowig.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/xagozotavuvekometolejejeg.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a004abe1059---35976532341.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lifadofum.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/15230500111.pdf
    • http://poorclarescork.ie/images/62697609763.pdf
    • https://vieclamxaydung24h.com/upload/files/47245572412.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c4f22d9f---72865792460.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab39239ee---feropakuj.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u9fq3a3tro1po8kk2757oqkos2/rutabojojobelaboxugut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+about+me+worksheet+for+5th+graders
    • 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_off0000bb70.bin
aca4a24228639519ff25944eeb28c5d24d91878c611ec2f20950bdeab3ba1f71
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB70 11140 bytes
font_01_sfnt_off0000d570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 16792 bytes
font_02_sfnt_off0000ed82.bin
fae199867ccc5841f27c992b3256c6abd0f8fc435577313bb38562facf6c6c65
pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 16264 bytes