Malicious PDF — malware analysis report

Static analysis result for SHA-256 534aa16c167f982e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 14:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca4dbd213eea3c7a70254517da08e2eb SHA-1: bc9d64570f821d6a228f66e4aa60e5b5ef7de4d7 SHA-256: 534aa16c167f982e455ac0b73c9a5ce6de8a78d3338bb1162e370c7e311db764
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akconta.com/uploads/files/617002091.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/zozavebupogavuzaje.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0338162a5537001a8f96ba3736475e06/kasuzima.pdf
    • http://k-ookuma.com/js/upload/files/jokuwumaw.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/todujizurupilazinotenupe.pdf
    • http://caratow.nl/userfiles/file/65666500278.pdf
    • http://xpressup.com/userfiles/file/54933237323.pdf
    • http://art-lan.ru/uploads/assets/file/16375725076.pdf
    • http://shs1977reunion.com/clients/41590/File/zoruruwafimis.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e9a933b9e79bac24ed21142db906d6d1/68039234758.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xiluxusutat.pdf
    • http://alliusie.com/userfiles/file/84826632650.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/75681887466.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d23plcnb20ueatuu3dkqgkt12q/faferu.pdf
    • http://greatnice.club/updatefiles/file/talavumowipimale.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0018b0b1f---26930510043.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/mitabipaz.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4691a973c---nokowe.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/94700194544.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c9bbef12f557c6369de5658586627902/27917193982.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/64154799287.pdf
    • http://studiomanzetti.it/userfiles/files/birezabumuzelum.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/787a63dba4dbe17c32b18094f0e10ddc/74272146536.pdf
    • https://taxforce.nl/userfiles/files/18123171177.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eedad2250---6060630379.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/41e7339ef413383e3b35d865e941212c/jitetinexam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=euro+pass+cv+format+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
font_01_sfnt_off0000ee4a.bin
728b88de2cfacef890e25b142ccb3e2a4d8aa78ce6bfd26409b52099273e4fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 18572 bytes
font_02_sfnt_off00011d83.bin
479569f722d0b75970b45774b37364e648c772f014d7770e850a7eb1bee0ca7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 10556 bytes