Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68fa91159558359…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e1a2e15949c8ac4e46900a4f3cad2a0 SHA-1: 516d792c5c0e103300a485b11d2cf1ead179d1e4 SHA-256: e68fa91159558359a92ed0ed7ed289c2093f926bd3632837dfcba4212199099e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are typical of a PDF-based redirection or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=white+tongue+with+teeth+marks
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mthv7tmu20ankifvnskkqlbrq2/86793164709.pdf
    • http://kochamsushi.pl/UserFiles/file/xutifiwimutokosamuf.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87dc82de7---fojapagovemapasidabuduvos.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af57650a8bd---xisamoxezebimotigin.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b43001cdeba---60863664806.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4lnu76ib9b3p4hf2asknlfl89i/polobojexibizaxulodoveme.pdf
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/79142255900.pdf
    • http://ampletrekking.com/userfiles/file/medetogexum.pdf
    • http://tai-group.com/upload/files/gidenowijofupomudugajok.pdf
    • http://hzzxtl.com/UploadFile/file/20210624073412074.pdf
    • http://afghansolar.com/userfiles/file/lutebotisilewakenuxotoluk.pdf
    • https://stopserv.ru/files/file/fosazexenibik.pdf
    • http://cmtsport.com/pliki/lerezubotajimuronejovol.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/pepefer.pdf
    • http://xedaptap.net/userfiles/file/44639392492.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b05e2676fe1017f5d713ad5b0deae4ce/pexodividitovol.pdf
    • https://pet-fashion.ro/mm/file/nesixifuveso.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qe9csb30hm8scbdhkac28g00l6/majel.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1e6628cf---maloxigizi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9a326a32---kukoponiba.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdf
    • http://tfh-filter.hu/_user/file/wakodipejobibebe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafdb12b08---momuxalazi.pdf
    • http://carszana.com/image/upload/File/63976732333.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_off0000ea61.bin
97691b44b712ab958537510b6ec7aa6a546c3cc3346ec57836dce728f069fe62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10780 bytes
font_01_sfnt_off0001031b.bin
dbb88cbe34235301a21afa0d5b58566eb4c0ae5dcebdeef1bf52a1180ac45a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16784 bytes
font_02_sfnt_off00012e85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16792 bytes