Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef140fdca3e2e67…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 00:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c07c2b17f56d7dffec3fff0941f25e SHA-1: 142d5c09df4d9358bdb9ca9312337ff0db0708d7 SHA-256: 1ef140fdca3e2e671260cdc03a21f2a06e1508fff55e77974dc34761cfd59c98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://archism.ru/uplcv?utm_term=once+in+a+lifetime+lyrics+all+time+low
    • http://creativeindustries.ru/uploads/userfiles/file/34740479044.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/999104f8fc32d6a8d48c307682bdd220/rujezawalujota.pdf
    • http://perles-del-beya.com/userfiles/file/43990305023.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac88c1839---nufeleribipegunidobol.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b24e84c2---welofaxugipitejidof.pdf
    • https://detector-billetes.com/Imagenes/file/rogijiwewejirezotesexa.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084961c09b87---10626954911.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2a27a2ecba5316326b73829b79bede15/pugupelomimoburexo.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f80ad1541e---56391851727.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c02425af4ba---97313052193.pdf
    • https://steklo-shik.ru/userfiles/file/36085578103.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a051acf---93664817211.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3b21aa71f173df4dba1b734fed390d70/29411387242.pdf
    • http://pwr-tech.ru/userfiles/file/dazarepivuraba.pdf
    • http://boilerservis.ru/uploads/files/80709387283.pdf
    • http://hitecds.com/userfiles/file/62737674474.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/42431dbd40c1b59f463b204591c82bcd/87354120725.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b3de8f77---59267825713.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01f19ec4---sunewebexelevasafonuvumiv.pdf
    • https://777mto.com/contents//files/87049763395.pdf
    • http://mtecommerce.it/public/news/file/pakunerivinuroxumaleguze.pdf
    • http://alituncer.com/userfiles/file/33750033075.pdf
    • http://pc75.net/upfiles/file/1621496856.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d584d93caac603d957e90f8731cd7ed8/redaxupix.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/5h380prbhargjjhus535u586qv/tedevugej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e628.bin
f23c99097ce0fe7c77b5872dbff8119267cf7ad2af377a9ccdcdd5828de102ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10720 bytes
font_01_sfnt_off0000fee4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
font_02_sfnt_off000116f1.bin
c0fc7736146ba0fa39904bf62d2d0f118f4c3487aad28463f98739c55c98afcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 1816 bytes
font_03_sfnt_off00011f7b.bin
571d5df1e2ea49b51d5477942ddd10838f3dfd43dff6d5b1a6bd8d748cdc1eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 18404 bytes