Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fa7f949be60f69…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 01:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03478217ac4b9431fcda52e0052adae0 SHA-1: 85e40e8043feafd9b4f39fba3c36ee36a23fa39f SHA-256: 05fa7f949be60f69e17c6b63b9c428a658093c8b0c9a30e8896a60919d4f3214
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=fraud+prevention+analyst+interview+questions PDF link annotation
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/475522842d6c73fd025c4111e4faa59e/xadorupefufijadixijiro.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4aa1df8febe3fdd2d1c16a3f73cc539a/sulapopilajebewag.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116db039e8fe---fubamafomolijaxuwidodujoz.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/s3e3o352fu92phfhoothg96ci5/2649132787.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-24/20210524031350860775.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae764a357---63593346718.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/57835281747.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6feb5b53d---22754909725.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/0c17b35b821eff3fc1cac1200f42bdee/75178042523.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d81f5f0---nuwiwasabepegiduji.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072572f2a9ff---64251873233.pdfIn PDF document text
    • https://lemanssrl.it/file/maziwevevadatinibodovoji.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108300046231990.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/76823920400.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kiwemevopavudonamovibewu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e96e950bbd---45230536525.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/172481dd966d5c9abc95a27e8b0db233/tajejunenigumafenep.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/85172110431.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607754906893e---36339511061.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/44816182616.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed959fa5f8a---davej.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/6075531683.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/73109510495.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/tetabusozelomojavawone.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_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 17508 bytes
SHA-256: 8b4568acdca7f1d049bf3a1271e859312422e7b877a7afa1fc80e5947308eb25
font_02_sfnt_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 10872 bytes
SHA-256: 4c218054478748781d22100b428932f3c2f5cd69e49ebdebd9d15086396d274a

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