Malicious PDF — malware analysis report

Static analysis result for SHA-256 2549cfcdb989a61e…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 05:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35a9115e93a36105f8d081c251d21f56 SHA-1: 0c0e6717d450ea15d1d7137c1fc573d1a9601b21 SHA-256: 2549cfcdb989a61e086736045fe1b3611d291dbb9ce5a4460cf825fca173f92c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac05b6181---56263187562.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/69a2066655fbaa2aa8ebc59325bf17a5/39505728510.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1616c6197401962b5a67b9280a03e940/7577790456.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6dc9c3c6---95011893011.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8ea6be4ebb4a6ae0af9d021d1bb69b9d/96884624146.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/92762707656.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a080f737a5---vilopurudi.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210530_FF008004D35A4740.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/40132380561.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/laxotikuzemivi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f8247f3b54fee46feaf5dcf215abfca6/repiduxidi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/32150414797.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/15378519588.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jevefanipeniwevivuzuzo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/123389f03a36297fb1db88559cd5b119/85972922119.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/tumosikuzomixam.pdfIn PDF document text
    • http://sbkf.org/files/files/15979245309.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b588287eb03---zojofazabonixasagegak.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/51212974585.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///98452706595.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/56075041063.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/22818204836.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/60804312674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hayley+atwell+gayPDF 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_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 9892 bytes
SHA-256: bab5a9cfc0e1910635926a024990de4fd1dd8b42c26820701d318cb796892b0c
font_01_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4C 20400 bytes
SHA-256: 7f7ece81fbf5419c6577b827090acc765d9eb72d67341ee33d27cab2796c2ebf

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