Malicious PDF — malware analysis report

Static analysis result for SHA-256 de56e0dab1792878…

MALICIOUS

PDF

82.2 KB Created: 2021-08-16 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b68046ebe99bf94e9645766b73847e2 SHA-1: fac03bf31da72be8fdcc601bf01ed178fe81c86b SHA-256: de56e0dab17928786c8c1bc0efe959139d4e27b315f2aff7d060bbfa9f149871
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/15898064327.pdf In PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/vebobikuwenodu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/53320183678.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/249te8ndnqs8urd6pv2up6rndm/tadekopowutiruwipapin.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rehbqiukfm9atoqbcmuelki9r0/23978718000.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nivoresozinug.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/40530883738.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/46ff660f6a288e0b5e32755c2054a144/sodopobamexeradaxosi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/57074415110.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/lekodo.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/92210942188.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/jonazojatalijasepu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc7289e7c---luladinevobowon.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a226c10ce4---4587868901.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/zavexugopatamo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-7/20210707161429933986.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/39395658486.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ue6nq3u68on6anuhknmbrc1ott/mumazaj.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/20941587487.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6888822ba090c143d244e6aaea3408c7/14792161231.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/30561036550.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb3eec44f---mijanivigodelikozakob.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-6/20210506231333156097.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94a991258---36575303218.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/90095607444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+failed+romberg+test+meanPDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 10936 bytes
SHA-256: fc5f50b8beb9746bb2b911b8314b0245a0907e6d64875229117c8130b6e8de97
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16732 bytes
SHA-256: 20d5f116075fc3c4c38ac4bd477122bce0978ba6c6791d6d12a5e4563b000296
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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