Malicious PDF — malware analysis report

Static analysis result for SHA-256 5735e4523ae99882…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 21:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb02c27a89b655c4b4739b398b8c61ad SHA-1: ac4d2ee8d260b6f9d5e1d3261d1bb1cd91263e95 SHA-256: 5735e4523ae998829545fb720eeb9aa7883327282055d88bf3a70af2c3eea62c
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to external PDFs hosted on various domains, some of which are compromised. The presence of a 'download button' lure suggests a phishing or social engineering tactic to trick users into downloading malicious content. While no scripts were directly extracted, the PDF structure and external links are indicative of a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stiglic.sk/userfiles/file/tidilorimenokojanadusir.pdf In PDF document text
    • https://mudraconsultancy.com/uploads/files/zalobetopisami.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/nopidun.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/34709605479.pdfIn PDF document text
    • https://uangraja.com/contents/files/zuluber.pdfIn PDF document text
    • https://swiz.eu/files/editor/futadawudonafidud.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/vosirosikobisoluz.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/lunebigetufivizire.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/batexepufo.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/67462663395.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c26795300ecd22bdff6cdd9f82dcfe30/xenatiwerenidakudejog.pdfIn PDF document text
    • https://subded.org/userfiles/file/56315550379.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/11765422371.pdfIn PDF document text
    • http://darec.sk/files/files/jizetulatoxebediti.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/16437308113.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/7340489008.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/31222500479.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/42505658748.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/telamarakonu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613247471502b---22833787454.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/45627033339.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5751810a1287ec911b8817c43e2c0212/2805624044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cast+phone+browser+to+chromecastPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10760 bytes
SHA-256: db6cbe89ff6290764ce1f63183572cd40f5cb0140d58933d5bab8caa5dfed6d7
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 17568 bytes
SHA-256: 4bce0db25530cba0145fd047f09a8090ba1cdbac9af4f2d06ebb559c958fa810
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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