Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3898968773a0281…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 10:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da375c083669f7d4c6f0cd09f9297a4e SHA-1: ae4ba8740c366358e0daf6db4cceca7fc6981090 SHA-256: e3898968773a028190298ac4e791b5fca359cd261e54ceb5f170897a12e309ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=chhichhore+full+movie+putlocker PDF link annotation
    • http://happyland-nsk.net/ckfinder/userfiles/files/44813988600.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/wukizudot.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ipd6d643usqde04582dm63shl4/zifanezorusa.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/94851449380.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/48780194688.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jexajalus.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/dudotufadamobufovozob.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/wamepiwumopexib.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/27204179465.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/q5kjce6qojcpro8qt625k8pf5h/firozomobefegegiwu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/25298754862.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/dawefokibododonumaxov.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/rigelozosuruforotem.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/suvojipipavakexamin.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf01e28f53a27c78a8346ca301c2bf59/logowali.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/21345660727.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vuvitobukomebakaw.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/40513878122.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109281518039993.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/guvurubopexin.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210922/210922233249250567m7co45tgbc9c.pdfIn PDF document text
    • https://777mto.net/contents/files/lexuk.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/27240912255.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/86620728826.pdfIn PDF document text
    • 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_off0000b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 13772 bytes
SHA-256: 7a8118d6786bf82efb836d691befc7d80da73c44a82bf17436bb91d30b8081f1
font_02_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 10600 bytes
SHA-256: eab56c937a2c31c6b913e0494fe1c4ca2b6a1a764cbf492d4c5fdffe21f0f5cd