Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe304893597f4ca9…

MALICIOUS

PDF

88.2 KB Created: 2021-07-09 02:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d3c6f97ebf1c623ba5f3aad99099bf SHA-1: 2cce25eb90b5ffbaccacd5831a2c8d1b6a95bc32 SHA-256: fe304893597f4ca95f21457bcb32b598502893850365f94d46679e9c7a95ec0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 http://www.mediagrand.hu//data/editorfile/6464526426.pdf
    • http://nadiadsa.org/userfiles/file/22092540409.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be87ce3b---fizuzewowekumikik.pdf
    • https://gamaconsultores.cl/upload/file/zakuvuralose.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b22157d5---koponebave.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429bed9f9---gesorenaberi.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6051c58b91---15070427765.pdf
    • http://princeverma.in/uploads/files/21565344264.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/pvnqcimpls03on8884a8n2nlnr/punovagibezukavusatezo.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/mugenomutoripufariw.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tqoaafhp5h2hs12ianfakgi6mh/39562494018.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf1987ed9---kutavajifasovokikoxugi.pdf
    • http://www.moyekolodin.com/files/kivusabatigogaki.pdf
    • http://ledson.ru/upload_picture/17249994003.pdf
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/69009337106.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/78e942f85b4a94b0425528e52ae976c3/14619785000.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7b36ab5e---53842981136.pdf
    • https://navliecky.net/userfiles/file/65050084533.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98722ee25---50284887616.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6a423ef17f5a6e75aa2c51042e61de73/suviditavenajivusufuxo.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/38483667d30af9388128d4203e5b9774/nononuruvatudutelijipu.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83412e2a65---81155649070.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/t2mg1ce5bes7odm8it0mdfemd0/5696841853.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e6a64f63---32762697194.pdf
    • https://cottingham-group.com/cufiles/files/pezelurunileteteka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=another+word+for+magenta
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e783.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE783 18328 bytes
font_00_sfnt_off0000c249.bin
cb2c1f93059e65ae19f6723bdbea91b5f21a540a5b1f5b5d6a37c9ceca1db345
pdf-font-stream PDF embedded font (sfnt) at offset 0xC249 10560 bytes
font_01_sfnt_off0000da09.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 3464 bytes
font_03_sfnt_off00010520.bin
780bc53fb9e0f49be81a69eac18b8f048cf0ea6147705fc881cae855eca628c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 21724 bytes
font_04_sfnt_off00013a8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 16792 bytes