Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b7035df0bbbb41…

MALICIOUS

PDF

85.2 KB Created: 2021-08-08 11:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c615ded513c9e0a04095b42f076c2a96 SHA-1: 73b2ec72677ab3f2b5c0152d810774a3f6b6c3d1 SHA-256: 54b7035df0bbbb419522d9fbdc8142410de100173b23b1136f623bcfdbd50c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80bdedda3---77771920989.pdf In PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/25543179779.pdfIn PDF document text
    • http://fgosvo.ru/files/files/jojusedelopititefu.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/97211389962.pdfIn PDF document text
    • http://hanleyresources.com/images/veranoxuzizerajijikobizo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/solakupekerunibo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceac2523db---64989653949.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/81458659003.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/9e038c9ca47cd5e232032bedaac567f8/funixazokovopafejuv.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/selagago.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/67555736155.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tetufedekiboledug.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/4342606052.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/kujenoj.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pu17tfpgeq9jk5h6qn0qj3mq07/tetezosonukog.pdfIn PDF document text
    • https://lemanssrl.it/file/95319708442.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/90795331568.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/74544565343.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a4eedcdc---mamevakeluwaruv.pdfIn PDF document text
    • https://banghenails.com/upload/file/xavetilufiropowoweko.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rubelovufagubibogiguze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pjb1an9618iopm4cv7gop31gg3/famakeb.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdde61677---nuluruse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ifrs+15+exam+questions+and+answers+pdfPDF link annotation
    • 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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 18040 bytes
SHA-256: 51941e1e507e03db00b8fa36fd84128a65ff4ada0d216712dc4113ed4bc432be
font_01_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11184 bytes
SHA-256: 3ada912cab4d998d42ee92a1921dd5dc0462e68811a2c05eb5f9255304b33d2c
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1