Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374b8a0aa8a9dfb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 20:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b2e51d5ad691e1b1d764689bddafb78 SHA-1: 3f146edfad73fba2608b8db0fd653010292c5d63 SHA-256: d374b8a0aa8a9dfb9aa22a95957f1146bdf638ce9ce27fbd6dc3621c991d5e5b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=android+linearlayout+clickable PDF link annotation
    • https://macauroommate.com/ckfinder/userfiles/files/besibozanoseti.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a131cfb21---basipijemenujepusoxin.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88138715650.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/63606826326.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7aa545c4---43283470576.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/5311201744.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/wudotusuwakekifome.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f74b94f39843dd23b95356bcd85eb0cc/8427222183.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131277ce2239---34002161350.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/piwodar.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/59586867013.pdfIn PDF document text
    • http://k1a.ru/images/files/file/27140495221.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/96315702260.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/54180104528.pdfIn PDF document text
    • http://uteambio.com/upload/files/31818292724.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8de4daea31bbf008442d4f08951fde71/jejesoxibokufobidafasit.pdfIn PDF document text
    • http://svx.su/ffile/file/jijamijewotusu.pdfIn PDF document text
    • http://besteva.com/upload/files/2017042593.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/31504433906.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zafar.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fonobujuvo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gelezomeroripenabolifew.pdfIn PDF document text
    • 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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 18004 bytes
SHA-256: 93279e51a45768df230afd558594fea60db7f11789aa6ff1cc2cc3676e9a9e57
font_01_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 10620 bytes
SHA-256: ac5e2111ad39c083af0b43df28851f7093480a555bc65cfee0263a500e68b2f2
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1