Malicious PDF — malware analysis report

Static analysis result for SHA-256 354e94d7e27c5963…

MALICIOUS

PDF

76.7 KB Created: 2021-06-26 10:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9cb356aeb00ae44b4c4b81f4613897a8 SHA-1: 04ff01723c68efc6017ac0a435c541dc3698437b SHA-256: 354e94d7e27c5963f6a7ad272c87ad6bcfe53092220f81393da4c5ae5bb4615b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external resources, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://olsztyntransportmedyczny.pl/userfiles/file/99703732341.pdf In PDF document text
    • http://angelcabrera.com/FCKfiles/file/58473063674.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/15783072959.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lufo46ck78kegrcs62l9j6ppr6/nikezo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tetisuwig.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160899e9d7e9d4---sexibaperurap.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sfvf49eteg7v5jq9g73njbr0pe/witazukow.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c045bbc7aa5---mitotupolimifadegija.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d130fb1b6d---13539043694.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376909a70---98611945637.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4c454800---35590235028.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/tivarabupesinewid.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c605c999---37772186957.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3bf9a5790776526cd6c4ea45bf61bd0d/35465871616.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nadoxe.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc70e68d9b---1046483107.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/p59dskfgdl61bicb8queosaop2/zotegeberuxoravibupe.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/94723319613.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eecc6c17e1---fipilikuruneze.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afd15d838aa15669104e838928e71ef1/javebera.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d0d01d05---63231758340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=instruction+level+parallelism+in+computer+architecture+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f8bfbaf3f0d852a305f23590e6ff24a6/jegovugek.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_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 11004 bytes
SHA-256: dea7cd5f91c47261ab6fe57b5b08a38ba77c40ebf244ec5b5295e4eaf3885c1d
font_02_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16360 bytes
SHA-256: 98d85fa978946fb9d4c8aaa022314d879f5ebadbabbe2c1abe77ffd07fe609b8

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