Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bdf10de221842c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 15:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d3b9e965ea822050eb0166501ecf8d1 SHA-1: 7384fe68309029c29efe86d22f46308587d02c58 SHA-256: 34bdf10de221842ca91f6e8a1e84798750abbbced5d744892d0ba2b881163f0f
164 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, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous links to other PDF files on various domains, some of which appear to be compromised CMS upload directories. The presence of multiple PDF files and the 'link farm' heuristic suggest an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the overall structure points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/13088918653.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a43d60e---76503214044.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/46302033439.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/304eda29510784fb0a495ff1092cb150/74394920534.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/34361865240.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/89888614858.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/mijajagonusokegasenon.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rebibigilotatefo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/86076759020.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613832639e285---dagulobuxufukokiri.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bojeregiremizorowivufiven.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d0a949945e2b2bb596dfb386008ba3c0/furamujasonejovuk.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2271a2f---56279430131.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a5546d18---tixorufovopakixoxawono.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210911122440.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613377f755ba6---8620282778.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/94772530271.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210910175208.pdfIn PDF document text
    • http://espwireless.net/uploads/file/82967501101.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/julojipolerurifekitat.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pevidigopuk.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/zivuzagugenawi.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/kuvalisezepafi.pdfIn PDF document text
    • http://shamayachts.com/upload/file/81057591862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=khatre+da+ghuggu+full+movie+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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 17256 bytes
SHA-256: 093b90aae0a19a9671d1b671e2b68074b1a97ee69a349c728fc73a8c55ffbd75
font_01_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 10876 bytes
SHA-256: b36b10925c720a45ae5f9f67753469a3212a96289b01fb75e556c15c06367105
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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