Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c4841807731b58…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 21:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70253eae1a52cd829b8c148c58fd8dd8 SHA-1: 7dc1060e954c7362f74bb3a7ca95ef9ae05f51bc SHA-256: d0c4841807731b58eae07ac4b2d41dba96692fe3c5bfd31521035ef15c317fd4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+move+pics+from+gallery+to+sd+card PDF link annotation
    • http://www.almansori-ye.com/almansorifiles/files/netiwufolujaraw.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/46639736749.pdfIn PDF document text
    • http://kdekdyjak.cz/data/tilejivix.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zoripit.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/39221809588.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6fff9e8d8bd8b83371ebf71827011b49/61719253144.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401904287d0---tezemunelofalime.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cq2hm2k0g691rk6pp9qqvmt7av/bovazotef.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141b45d8f79c---xeziwovavufenigekuvaj.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/govaxudi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9242a7d0---xejovarexinojat.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pasepunaxozuzogebup.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/81495923768.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/92519685449.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65345888417.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/85439598998.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/92686146415.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/guwutetotafukoninuweza.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/31052297824.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/xegexamugik.pdfIn PDF document text
    • http://rayanchem.com/d/files/napubar.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2379c424a8da52d1f926feb4831c9478/60043951186.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/rudokifatefagugo.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/kefedenolezemudirogiri.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/riruwijagam.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 18640 bytes
SHA-256: 2e1aeb0241db5a1e7ea1883347c812979d1467c273cb772788c9bb7ed9beaaba
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 11116 bytes
SHA-256: 1e57e2f308ca7b42aeea04457b18ca9e2230d4dc9e2d99a84ad87a1ec3f6407a

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