Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caaca153aa02cf7…

MALICIOUS

PDF

102.1 KB Created: 2021-09-03 23:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f11a4715dd39ad4663a101aecb9d4f6 SHA-1: 37acefdf4fb8432287c252df3c8d6595e0e822a4 SHA-256: 2caaca153aa02cf726dd95e5bbbb962638b9d33e41142be306b4c98f5c002ccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised WordPress installations. The PDF structure itself is indicative of a link farm, designed to redirect users to potentially malicious content or facilitate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://wastran.ru/uplcv?utm_term=list+of+parliaments+of+the+world+pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/okq9lkjj24ga800paatoqe89vd/feditawonoli.pdf
    • https://ipic.vn/userfiles/file/kojawaponamumijufesugupi.pdf
    • http://karpatskiles.ru/store/file/finakegami.pdf
    • http://dealershop.es/userfiles/file/26790370234.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7h7ggig3edoggjjlbd8meuufvl/kikifa.pdf
    • http://driver-jazda.pl/upload/file/27218071628.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4cd59595ff90c1fb887397e2e1e14d53/ganigarazifedimovoli.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160719ead07220---wufozutipedoso.pdf
    • https://samudra99.com/contents/files/78130177058.pdf
    • http://caogenzhiben.com/filespath/files/20210820103039.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5560d63cf---mululunosagawilerosasuva.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pvbh2o394gcvqe3jkullsug7e1/nagume.pdf
    • http://longthinhphat.net/uploads/files/23828326159.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b739a40d28fc5bc3e1f69f12cedace3c/39619548277.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rngdifcfn7i5r11djfmbdm0aol/47526975290.pdf
    • http://abwrichmond.com/uploads/files/54709520122.pdf
    • http://adamlegal.com/userfiles/file/jofepifavovozadifalewevuf.pdf
    • https://anthonygillant.com/userfiles/file/13348973724.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/1567f10d8cac23ca5eb504384a1a1553/52543933685.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ae86ec4599aa88cabc418cb8ccc4966/modebewekomadakujajof.pdf
    • https://aedwea.com/upload/foto/pujuwifiwadotutikotuw.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/64d306b0a0e66b8651844752b09e3dbc/37351441978.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5aed1ff0faf2c2ee2dd3269f24e97589/ruruvuvorat.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdc1e78b24---7464689864.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_off000119fb.bin
50d63c676c6b779b4022569ec31a49034c98641ed2d4b3cb32114880d3073340
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 10808 bytes
font_01_sfnt_off000132ba.bin
c28bfc458a04337e709c1243c4250d04aa77b9e10a2f6bada0999fbfb11af422
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 24684 bytes
font_02_sfnt_off00017212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17212 16792 bytes