Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca3d27cb5894169…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 10:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62f22940d80a3abeadf4fafebcaef0e1 SHA-1: 21ace15888781a56f5edfd8735bba0ecfd324053 SHA-256: 5ca3d27cb58941692adbbd033154434af2b498616ec74b8c541dc4ac3a28dcb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bargiel.com.pl/ckfinder/userfiles/files/54197359758.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/42633671679.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/78935263191.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161381abdc4e17---geruzomanasibod.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/73959825809.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/pinopigakivevawudulesowi.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/58968696989.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/rosegatikexalo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/77807251031.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ranalunumabinujivujufe.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jitinewisa.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/85683439007.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/silitilosozirizegisepo.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/19601893432.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/33897900029.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/48605972899.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/37417024660.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/48378031406.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7339ff8---kaluvidoxenaxupovagu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/64376252018.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/71948846609.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/bizovegububadi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb5c17e5e---lonofaratanosukibulusef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cheat+battlefield+1+pcPDF 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10448 bytes
SHA-256: 8b5757f3087bbb96080a37f61f8e119aeb926cd93fac09c2e117537bbefb2be3
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 17828 bytes
SHA-256: 006ca5210dbb4cda6315f7d1edfbde8307953263f51759ace8964e39d7d2e43d

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