Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d43571ee7d056d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-30 05:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a290214db1ec5a53c01e206fb314292f SHA-1: 4e78e5db672d9f2185ae6d827bdeaf3cfefcc92f SHA-256: 58d43571ee7d056d0b5e4696cd10ea202b7d949bfade019897e5b82a544ec6f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arrayamed.com/userfiles/file/54579773025.pdf
    • http://xycrusher.com/d/files/52023756981.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/waxerejakokilotulamikeb.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/11277b741b5a8e7808e5677f9cf3b955/powenol.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0f35d051---rekijuxodevisebafaluva.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103275c9691a---65907855856.pdf
    • http://busankid.com/webfiles/board/file///fozopekijorinuwukiware.pdf
    • https://diedacorporation.net/freesiafiles/file/32338236510.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d0861633d45215d04bf93a356d5a2200/wasijabalevafaxapalinunun.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5tfa825ds57unt7aduu7kgq14/59258090872.pdf
    • http://cuatudongbinhduong.net/uploads/files/65086332414.pdf
    • http://abwvictory.com/uploads/files/59359445473.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/pimalutinotoragejave.pdf
    • http://erex.hu/upload/file/8784007897.pdf
    • http://oishisushigd.com/uploads/files/73448476286.pdf
    • https://bdcomunicazione.it/file/85116881630.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706ea858d5e---fepoxagonef.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/27244190340.pdf
    • http://www.awakohchang.com/image/upload/File/7935630236.pdf
    • http://dzbnf.com/upload/file///10105029637.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/dawuzax.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b7e32f5d0f4f300fd05e57bf1581b783/nelijofanu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aecc3140d8eb28fd3f89c798483a6957/zekiboginusem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+v5+apk+and+obb+data+download
    • 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_off0000e624.bin
c9760963342e5a6a4bc116c8c0b5531da60e7dffec1519c58325346604058890
pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 17512 bytes
font_01_sfnt_off000113e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 16792 bytes
font_02_sfnt_off00012bf8.bin
a8e918924b64808b0c036efdac51fb7e767900ea15eae434dea48a909b0f7850
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 10448 bytes