Malicious PDF — malware analysis report

Static analysis result for SHA-256 8802e21fc8ea9be9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 05:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea949393909efe3496c19a59b01a4d79 SHA-1: 5354666ead659ba33fa4c97ae30f416229137c59 SHA-256: 8802e21fc8ea9be976940c00cfb1a0f624bdaddac62abe508fde608f308d7955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=health+through+drugless+therapy+pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34766691703.pdf
    • https://artenika.pl/fck/file/zupikimonojesikivagirexe.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/84541456994.pdf
    • https://egc.ecrom.work/syo/files/revodasokexewowu.pdf
    • http://kk-gorenjska.si/uporabnik/file/12224363577.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/totekoton.pdf
    • http://autoscuolavalerio.it/userfiles/files/jofulafo.pdf
    • https://anmimar.com/royal/userfiles/file/65403626314.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0e10620a519bc94ed85c47253ca3c618/25918498170.pdf
    • http://haisushitogo.com/uploads/files/54636130074.pdf
    • http://brilspa.ro/userfiles/file///pupugegoluto.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebac71de8a---fomebozikopesifavezi.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/58297516919.pdf
    • http://choragwica.pl/userfiles/file/58409924317.pdf
    • https://worldcastlive.com/userfiles/file/37901274443.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c40464922c4---ravodazorejoxebigivoj.pdf
    • https://privatecambodiatour.com/userfiles/file/fobafufobevaja.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jaxevamugapetufop.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b818a6a02---50397090557.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a3d65e9b975c74a25256ee8fcef530d0/xumuj.pdf
    • http://jandebruijn.com/uploadimages/files/limitupixanotelekowol.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf6be52435---9215005447.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3432265111f7006531aee47a91f4fab4/gegivawomuw.pdf
    • 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_off0000e549.bin
b9786365a4d43c759a4ce41b1107aa7d6e9a8424c6a85c8498517cb3630924b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 10784 bytes
font_01_sfnt_off0000fe18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 16792 bytes
font_02_sfnt_off0001162a.bin
a9ef5eb076d9bb736dcefef18eba156de7bc05fa9c9bc70a77cf451338424b2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 17976 bytes