Malicious PDF — malware analysis report

Static analysis result for SHA-256 1468245669b0d819…

MALICIOUS

PDF

78.3 KB Created: 2021-07-24 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a168819d5d07b98211718e328042b4c SHA-1: cadc244923ae42db59c65f272a9ff747d37f56f0 SHA-256: 1468245669b0d819163b0b51c20b91e48a090f30481c35bdfb9cb7788bcbbc27
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded JavaScript stream, though not fully analyzed, likely facilitates the redirection or exploitation process. The primary attack pattern involves luring users to potentially malicious sites via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac31d843b76494875f6fecdeb1fbf970/fazefemixilelatezurebevu.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f922ebc2bb8---54290936341.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/talojujejo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/tolezoxewuladam.pdfIn PDF document text
    • https://invest.pl/userfiles/file/30546068207.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bbc7f7f1---1808127592.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65325b7cc0---mujugajedarumiraxukazaju.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/rasifireputukasorarol.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/56785376065.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad6b4b1e7---xezutanefi.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fodox.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/gaxagen.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291614393356.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b3690077c---rivekamesifovotoj.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/97080632038.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/8218763148.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789f21ef097---pedisusufebuzaluwunadarod.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zijawo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/tukaxolavelepijutidorarer.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/wiverufe.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3fjv25tl0bv7hnnugelsonnha8/77262437751.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0uhrv58su2dbgmdobd3bnpb2/40913484273.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/09a7c42d3e5ceb2e6a3b19379bdfde76/5887500607.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4k9ob7oeh9l0dq4u2j38070md4/gupulejogosedidideniva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ehsas+nahi+tujhko+song+whatsapp+status+video+downloadPDF 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_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 11028 bytes
SHA-256: 64505e676a7c852cf48cfe4071381ae1a1da7c92fd1a053299c5e27a3849eca6
font_02_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 16528 bytes
SHA-256: a6ae3488727378a03813ae4f06a1d8770fac749c76d151538c7f3eb952c68bd6