Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de8fd390f7de8bb…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 14:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a21bb77d13a242c158dcfcbbc464252 SHA-1: e57cc2afa820e5214b302b7d689d6eb1e269f109 SHA-256: 1de8fd390f7de8bb78c877e8042069c134d613309f898bc0614389421c1973b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.irrv.org/uploads/files/takutaso.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af925e1b---37720690924.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p8qmi7tq8qe5uda3lku1r0tr21/kekebivufoxaga.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f29adce8---86272498945.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jkbl975vjpq85f1l4btve42ndf/luwejodatizavewelik.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097017eb07da---15580684604.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/85fa26ffa4956297027a3d3af6e4b558/wezojuja.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rl2hv51spoa02rgq3o16m1i2ji/zepijumimur.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/7b487fe77f32cfea53780e846ebb2b6c/85309776011.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5jmn4pomsrad0lmn4489qg1lu2/88966509452.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mrsbp9prcvfp3fsssqugshcgno/87759598779.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/mizutolajaxo.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0glgukegidr0ddlvfsnq673ffo/3599961831.pdf
    • http://didaconcept.com/admin/fckeditor/file/77510678326.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a29dead8c5f---tipowa.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b4f597c5c043d35b028d7f745e3f0253/madomuxev.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/on6he7e4jkejl4pmqk0q4t0nk1/kadelobawesumojobaperej.pdf
    • http://aceonlinementors.com/userfiles/file/91026749025.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=compare+and+contrast+sympathetic+and+parasympathetic
    • 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_off0000e489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16792 bytes
font_01_sfnt_off0000fc9b.bin
1f493d0cf31f058e7cb1d4162bdcaa6884c49319975587e6fee8188d6d696d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 17500 bytes
font_02_sfnt_off00012a24.bin
b6b5c13bf002df041718690f384325b83b63917e77651873cc422d6329bd6f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 10876 bytes