Malicious PDF — malware analysis report

Static analysis result for SHA-256 929ec1fe824759f9…

MALICIOUS

PDF

88.4 KB Created: 2021-08-11 07:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9993b05c34218972c2dc37b447ba15d SHA-1: fe2dcf8f9f90dea4a380b0472ecbc275bf4ece66 SHA-256: 929ec1fe824759f984f0bd518820b434e6b7bcfdd94c724fe8212b45512e47d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. The embedded URLs point to compromised WordPress sites, suggesting the PDF is used to distribute malware or redirect users to phishing sites. No scripts were extracted, but the nature of the links indicates a likely intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=ejemplos+de+sales+oxisales+neutras+con+procedimiento
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608028655b45c---19199447996.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca67e5722---rovafesapaxeliwe.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1c3e5bd92db963da55c1f7d33e097c03/421473263.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f1c4f8086eb5c0362c35b324c11bfbd7/4246759329.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gawapukafanibasotu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c82e996e---86814826810.pdf
    • http://cyc.cz/pictures/clanky/files/44149909536.pdf
    • http://asijskepotraviny.cz/files/file/jeranad.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49cfb755a7---busuvapadegetekuxivafejus.pdf
    • https://liffeyartefacts.com/fckimagefile/file/19389827582.pdf
    • https://adikkedua.com/contents//files/5607908200.pdf
    • http://yds-wcv.jp/free_images/files/kirisekomenut.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/subgtdghfl9i8clip12a26uapl/44815927303.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/69a493808ee4816e3595883b78fb4699/kevikeniri.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/f64tntd6d2mks9o47ej8h5s3kr/27569342685.pdf
    • http://oilmachineydy.com/d/files/61956947031.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e66841e1dcc---41556047972.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/89379486588.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6a8714c1c3efda2d3cdfb12cfaade4a5/kagajuwodikapex.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16070c75244305---zugupozew.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a5ce6c02c3732e3fb4b67dafce8165a6/92460679680.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_off0000f131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16792 bytes
font_01_sfnt_off00010943.bin
3695473035bb787d5222646defb4e8783d8494af0991eb8ef9ae73e8d301cfa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 18384 bytes
font_02_sfnt_off000137fc.bin
f0f6b2cec244155fc5ae7f0efe78076209ea75dc6f3ce29570c545bbaee56ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 10988 bytes