Malicious PDF — malware analysis report

Static analysis result for SHA-256 e054d311ae60044b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 21:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b545d5888d3af9aa24d8c01e14991c SHA-1: c06d794ecc39c23b74c8967aa3abeec23d734cdd SHA-256: e054d311ae60044bf121ed9ac1138ab24f07d7a38101ef359069edbbc9f8d193
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to WordPress upload directories, suggesting it's part of a link farm or SEO poisoning campaign. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious, PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=why+is+my+food+freezing+in+the+refrigerator
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/40067956344.pdf
    • http://stroisvias.ru/userfiles/file/65776047423.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c704f63c37a---litigesekigi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160739871b77f0---sinafon.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609835bbe7327---mutugakunixuxudovi.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf2143c65---71847776381.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3889c8102---99854626155.pdf
    • https://nepalimodelagency.com/userfiles/file/52697855847.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a413a427c84---73986052316.pdf
    • https://manenshop.com/upload/files/64947580833.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9d8cd660257322afbf20a0c41ea1d68f/mijuzosapeloxevetezo.pdf
    • https://fertilizergranulatorprice.com/d/files/10734140299.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5cabb66b8---39535901181.pdf
    • http://2ds-creations.fr/userfiles/file/rovolola.pdf
    • http://fashioneducation.ru/userfiles/file/19532998807.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba5d659d5---70674345132.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3f6f32c451679eb66ba07e3c6029577c/92930882974.pdf
    • https://mimpishiosatu.com/contents//files/99053162102.pdf
    • http://adabaskimerkezi.com/upload/file/fajusetik.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/617196ccf0a82bd07437e13bd06db5c8/41343396567.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4b177f39---96579845576.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d6925db1413060ca6dbdb006f1f3dabc/forepozujakukurokonumitu.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/50483957920.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609877c2065dd---77578502771.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_off0000f1eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
font_01_sfnt_off00010a02.bin
d10104995868e589a4752d15e8c95f4d9c53d99ca131fa89844f77fa296e0a74
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10924 bytes
font_02_sfnt_off000122fe.bin
4e6661c904983d0395425618e00159da5d70b121ec6b1c3c1f56d9ae3286a098
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16688 bytes