Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78701e48acd42e9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 10:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f344a24f8d3ba42628654f296509fa4 SHA-1: b7fbf7c93772068678639b3df9526c1de1310d63 SHA-256: a78701e48acd42e905096e3a7d3f527c614d870639061646e86361e2fb9e9ae1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics and ClamAV detection confirm its malicious nature, likely for phishing or distributing further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/2998d39ada5fc14afb71cc70d2df7a66/32396790824.pdf In PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/qjpooce7l1bas9jkeh3ilg5tq6/nivokatu.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/8948544100.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f62508fd4424687422d73bf727620834/lodufeza.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lofoderatatubikixusaze.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekv77at561iovfv6cjeimtb953/pixute.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/26366298342.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecfe751fe---wefewosebanumebike.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/43536227377.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fe2fe6ac769546972de419546b3689e7/12208039633.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/41651759601.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s2b2il3s7oav7hu7dr7439vclt/kinefedomadojujesanira.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2395acc165---wakuromowenunog.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fiduwuzoluzizubirorofuve.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70ab76514b---luwoziwolewazugeradi.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be6b8645f---zajefutizarobixodoporo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf2c7bb38---16490734698.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/verifobadamik.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/58286857404.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/zerejeridejogamutaletudiw.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609862a87d6f9---13452703473.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/32779698878.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/81542975867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=primeira+reportagem+pdfPDF link annotation
    • 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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 10524 bytes
SHA-256: b33638bc7d56a5140cec25cb3e42facd87ed26514ebbe11bb596b9a7104816a9
font_01_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 17848 bytes
SHA-256: bce7d66d75ad85fe8cf6ef9abc24a6431fd78476fbf80d30483e1ed9aa028b65
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1