Malicious PDF — malware analysis report

Static analysis result for SHA-256 a021f8d9a8c3bf27…

MALICIOUS

PDF

147.5 KB Created: 2021-07-04 12:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f20afa334f785cd33bc39671dc8f8804 SHA-1: 3c1d989744596347e643996065a5fe779b43db1e SHA-256: a021f8d9a8c3bf27411d1963cc99cd4929bf353e5f202ad218f8da262d9eb560
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, with a specific lure impersonating UPS to phish for credentials. The document body is heavily obfuscated and appears to contain metadata from wkhtmltopdf, suggesting it may have been generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=pull+your+ex+back+ryan+hall+pdf.
  • 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://oniceh.ru/uplcv?utm_term=pull+your+ex+back+ryan+hall+pdf PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/559bec2a191d5be05772a633c0a93b70/damefizomibejulaxujetaze.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7cd6ca333---zulavowuwetabudu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf02447bc9e---49919004914.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/sck01pd8h21up275hohvu3vf09/jazot.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/87982288f8dcd9692a322b241898b879/kovijikesebe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/50764196973.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/97912244700.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pigevewazenimewibomopup.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76786505669.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a240d6603---23959796510.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kozalubatawer.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e128d473343---55663616472.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a22f26cdc507c9cfe5c63005fff87356/bemogez.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cba56d8d921---34909537420.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073008797349---ranemumu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fe6cf06cbbe127e0cb3e8f399f7ad78d/doxewitowidozi.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/bijuvujixixupobikitonag.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fb9b86a8c---78250144448.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5ujov5m50h6bh9t558bfobbj4/61030525316.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dk27lqrj23mrhcpckv2lmltuo8/54368809815.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gubesitinazejimegapigime.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lsvo67g1cskjf72nqcbt30klsf/tipivijejimotutitux.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/megakob.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_off0001dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFF5 10908 bytes
SHA-256: f94276e8d39451337b229cd3cb2ff05bb77022d8346fdd58fc4531d7615a10a7
font_01_sfnt_off0001f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2110A 18400 bytes
SHA-256: 2e96453080c4a875b3c3f84995b053a656179f1eb3ecde107444b04baa1e5e80

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