Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3218a1340befcc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 13:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12a99aaaac72eac9daaca52d322e625e SHA-1: 006901ac632d7acebbbbfcf83e87687a6ddc60f5 SHA-256: cf3218a1340befcc166e9dba75b2d96860b7da91c1298d05ee064652d91b3480
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including multiple heuristic firings related to random and compromised CMS upload links. The presence of numerous URLs pointing to potentially compromised WordPress installations and disposable hosting suggests a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • 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://catamma.ru/uplcv?utm_term=pulsion+de+muerte+psicoanalisis+pdf PDF link annotation
    • http://aquatrustfina.com/userfiles/file/16708594345.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/obua0367dnke94f731oi329e7f/rexuvapodobazebigesixod.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/69984f95207e11576235acb8169d31ee/95879178656.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/31791341592.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/47e1be2o88ksdf485ieimue872/65296002528.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d3b4dc6fe---julixuwenatitupobat.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021728110361995.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/6003396542.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/67383214643.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/60083015652.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4e433830---17471009868.pdfIn PDF document text
    • http://lulanjina.net/upload/files/42998636135.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/wajutomidojitepome.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d9adfb73ed8b770c171d0e5daad71ec/73178106758.pdfIn PDF document text
    • http://sdds.be/userfiles/file/fewije.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/purekil.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baedfc51430---xojujupejoxuvavin.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/gurufamepuzakisojoralu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15cd47dd9b---vufetilufukomidef.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/56552804390.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/48999488664.pdfIn PDF document text
    • https://somogyplusz.hu/files/4949997184.pdfIn PDF document text
    • http://recrute.fr/files/files/pejorekunidowetoze.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 18840 bytes
SHA-256: ce51b9fd709aa01cc49ad72f093fb6380c306074a1201ca2f47fdfed847ad6a0
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 10884 bytes
SHA-256: 5c5af3512e4b0ebc69b5f4cabe7db2ff265768270cad2718294e0960f80767f6

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