Malicious PDF — malware analysis report

Static analysis result for SHA-256 027a90f9bd0ffecf…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15a04b865694088e5ae5096cb15af197 SHA-1: a5e0f9854b7d6a9d37aa5e553448eb1b936ecb6d SHA-256: 027a90f9bd0ffecf0fefd1ec981d403aa35e56d7b7307a690234a3a63095d83b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many hosted on compromised CMS uploads. This pattern is indicative of a phishing or malware distribution campaign, where the links likely lead to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/aee8cf62dc66bc9d41a0cd1ac2f0fb71/90807807781.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0e8b9e8a---91340786604.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/19f892a45db1e4d2c31a4f5c817fcca1/90271386618.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/92b320c4fb42efb10c28cf5e37d3b833/nufobijijikuruvarutogis.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4ae6aumfme9q3l23i00t3tgiu2/vagujidukujof.pdf
    • http://richmediahouse.com/admin/uploads/file/vapabelutifevole.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/j16mutojsmuv0nrd53t62cvk3d/junadop.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b3f841c5e495d95084afe1af92e067b1/68921939645.pdf
    • http://www.ferm-matic.fr/upload/file/lifikupumo.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4a8f1cb7ee27219adb1a26b00147bc6/naguxewegujarezulo.pdf
    • http://vinabomi.com/uploads/userfiles/file/makukusane.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/27e45d30e0cd19320ed241c9359dc3dc/91590130938.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/folikorowawaxurubekolosu.pdf
    • http://moscow-vernisage.com/files/files/batuxifikevokajago.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1e4e414beaa29b6ffc96e3feee5625e3/79627830729.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ee4c9c0c9a5280916bb434228c6f218c/ramaporak.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/82f6735bcfd96428d530daef7e9b6592/zukotawogixe.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d04e5bdcf3b6463fc2bb9965b2264f7a/kelomubebefolujowulez.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00f38927c---22069924259.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b686ae9f70---63402167807.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079345abbccd---84242287903.pdf
    • https://soechi.id/userfiles/file/fazadukulun.pdf
    • http://gramercygrand.ru/files/file/romexu.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/qut457m9t1rklsql7a1m24rbah/nigokotukofamufetijazore.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=low+pass+filter+scilab
    • 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_off0000dc44.bin
5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 2064 bytes
font_01_sfnt_off0000e583.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 16792 bytes
font_02_sfnt_off0000fd9a.bin
4c501b1785855c73929a4e7ddad16a553ed2974f7ef3baea5e336bd59f44ff68
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10552 bytes
font_03_sfnt_off000115aa.bin
c9d15ff460c459773d485f49858f288a9b3575cb5ba6c7f8ac54bea750518f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 19504 bytes