Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f3660f5fd51d3b…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 21:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c22fa1ff5d92e8d6bc1f63d28d3b546 SHA-1: f083dca99ff4f3e18480930ab02d92b8214e598c SHA-256: b6f3660f5fd51d3bb290b05a4e54cffb47ed5c79d3ae2b43bb2fc3a1ab480d49
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites, likely serving as a link farm for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to exploit search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://creatinglifeoptions.com/userfiles/files/8920091093.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/60492185173.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/55556898830.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/tavawonefito.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/30283149590.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/katakijagazunuzirosow.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fefed.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/58386248367.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/parimuvofoliguzip.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/50648364172.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/86467380171.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131afc4a3f70---lirevevumomug.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7fab0de80---52797495206.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/22517394274.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/vonapubon.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/51902828845.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qb0ip513eqb0vqbhp5uevm8t0v/mututikuwakizofifipon.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/9065177159.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b944471bd---21059544177.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/84054308604.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/90758619225.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/45377614123.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/428501889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toyota+frs+0+60PDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 10200 bytes
SHA-256: d4ebcad5f6d30d6ab617567db37f945a7e40fe1a11b3e423ea98a2c0a42e5ddc
font_02_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16180 bytes
SHA-256: e67eeac0fa3c86e485dd33d6dadfc49e2059d573a614957fe1e03c4691034073

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