Malicious PDF — malware analysis report

Static analysis result for SHA-256 be498a6ea6ea5ced…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06df0a0990e256551f7ab0eecbd21743 SHA-1: d692e17d7ffad6c843c80e1e899a7e0f2896c890 SHA-256: be498a6ea6ea5ced1c7c9a76b5ebc565c87357d8fcd95585cbeb5e7549b86a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80da7dade---seripobulolokanukozaj.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efab6bc1e---safewoz.pdfIn PDF document text
    • http://becucci.it/userfiles/files/wedizitovokape.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1428ec5df0---timibodojazamelujalomu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b053e6199d8---fadoxoguviji.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/bavifewewijodolunaj.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/79576691198.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609967f8b2a87---xapoluwo.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/pulofakexetamutesifujitiw.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/11926313248.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/134ae0d99e705367d73c01cd10ecf377/14573615045.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ba23eda3---bewabaxekifuzamitanirejuf.pdfIn PDF document text
    • https://cubic.is/userfiles/file/47074205534.pdfIn PDF document text
    • http://rjt1.org/upload/files/rowewaniselesa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749105d839b---23906641681.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780c940d409---59462049085.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/61721182407.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/ditanawamatawamewosegow.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0632f9d3e0---44240490641.pdfIn PDF document text
    • http://sswjeans.com/files/watakozotabowafeton.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jefokabekinumumeg.pdfIn PDF document text
    • https://kvzriu.org/images/file/dugow.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/nowezopu.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/xinuwubefij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fluval+306+instruction+manualPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 16268 bytes
SHA-256: fd53c63c0b5f343d8ba6bac256f78200ffcf04976fd96b9a269d4424863c3442
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10864 bytes
SHA-256: 8061c495572fdac1647cdf1ff6f019576ff77486cff0ed332f6d7594bd00504a

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