Malicious PDF — malware analysis report

Static analysis result for SHA-256 173545b3b85949f7…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 13:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ac4b4b9165aad2e13e637d3f85862e6 SHA-1: 51d76e0661c22600f11f7f6e93919295f2114149 SHA-256: 173545b3b85949f74816e602a44d1cc775e280a99b99e792a42653cb4eedb3ca
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65f94967a---vimususekiravigifivep.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/viramus.pdf
    • http://kasargod.net/uploads/file/8648483304.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/23b57914dccb8e16e91421206a14fc24/45089578947.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7f87f94da0cad55c68840f55c777682b/28354654243.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e9ee5047bfb34e6e6e4190d486fb33d0/15197224740.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a678ad39bc10b789257f72f86bfbac42/76431510772.pdf
    • http://aa-nusd.jp/sezokumafenilikezutero.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a036e1d452---16148349072.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160744169c4605---lubojadifozuraj.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9398e5e05239e0b47ad637aa215359f8/kerivifixiwatiwan.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1778de1a36---xexopobevosex.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/98a52077eb112095fea8d78e93366d9d/wopasonipar.pdf
    • http://eakqshop.com/ckfinder/images_store/files/57063282410.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d710548e---kediwatanusoge.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p5du5jf21ierds73t7s8dnqurn/pupapibavudimegatim.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d9815b13f71a5fae1573db437486ee6e/goxibuposisiw.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b6e73942c81223b9ee0ef8f584b45dc5/48736140962.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6def1be37fff02d78c79eb931b94b6e2/87706687391.pdf
    • http://sarlampa.ru/upload_picture/4415514686.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02edf30f1d---47341314691.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6149d9aa---29501178367.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9c63e2e24e7a03ab37f9cdd5e4171cbe/23652917233.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607115113c2d3---zokiwowi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stock+quote+for+epd
    • 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_off0000fa71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
font_01_sfnt_off00011283.bin
384b799b2f7cf8978f35d0f4a31255b95356f18ec1683e69e2531d738a95facf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 17668 bytes
font_02_sfnt_off0001414e.bin
4b9055498530dd8db999f94667adf9fd19f333e892f700d254add947e353a708
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414E 10456 bytes