Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23aa34a77bc9dd1…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 12:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23cd57d46066b8f59c14ed58034bb327 SHA-1: 9b10484cba51629630991b3a4960f162d6b00f86 SHA-256: c23aa34a77bc9dd1c3983d38dc829a282e55ff906faccbf2dd51d373848239a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://volareinmongolfiera.it/userfiles/files/xakifar.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee3e9b53a1ac251330c9e776fbc90506/tenufenoxapotixa.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/73694060368.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/jirorewogenimot.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e728bc4181308f6d7e611cb4905b5b7b/23173584537.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/21930722400.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/babc2efdc41f06c1948e50ce7bc4d425/vapajiraberul.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/jafunuxo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rimuvotujo.pdfIn PDF document text
    • https://tckontrola.hr/files/98075685632.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210603152147.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f380819b5---dejijefobafu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/27b729da628c91eb48177b5aa138cfe1/junolasilarigil.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bba851a353665494359534321ae2658a/75281360741.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1e90f6e---26043791613.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/79fd8f5380ee83e792140d990ec38105/nerifixomelok.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/6019523716.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/tolomed.pdfIn PDF document text
    • http://envigest.cz/upload/file/munikikofifo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7646316308---89308098120.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/mupama.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/60765974446.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3f8e2726---60065119700.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/sosebixotuw.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/gr9m46h71rdutin3fbtld2o9s9/sozegatedadisilori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+much+avneet+kaur+earn+from+tik+tokPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 18000 bytes
SHA-256: 95e4448957a111c30846b2429e4857493f87b67d671e689017a1a3b32b4b18d3
font_01_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 10724 bytes
SHA-256: 4b42588622a500c438cf2ef2288895f7a2946adabedba8652a0dff4de5c49c2c