Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f75653edaaec00e…

MALICIOUS

PDF

117.4 KB Created: 2021-08-25 02:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 004f244e2a2bb4fb00b1763c753eb321 SHA-1: 47c3f93414d3601820199402696969819ac86252 SHA-256: 7f75653edaaec00e17d6c149b969d402920136a5613d6a8f9070cc7daeb661e9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded URLs and the nature of the link farm suggest a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6090

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 http://arniestribu.com/campannas/file/falofemigixeje.pdf In PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/55035557646.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/3706442382.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/i0rrcgcln40b496cdrbjd99kgm/2837140262.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5798e64581---82588126413.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16098979ee852b---wuvepagejazelunadidamovif.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc904499c---lababawafafuki.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4a68eb5d---gozibupevu.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/43642996643.pdfIn PDF document text
    • https://daismene.it/file/6164554291.pdfIn PDF document text
    • http://skupka23.ru/upload/m/38779339872.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078022e98b6b---93390822312.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1c4679e663c564a70e71e726df43296e/35793262387.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1c54020badd9aa9e6eab9b0679a0cfcf/dinusawotegow.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sepewewejonuw.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xanekatesurite.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/faxevunuxenoxigupexuf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7524be89---6024344975.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/remewubotevu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094272c8550e---69904770819.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2ve0k57v6vqdk8didsgj5u0r1/73954598527.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/viboxebubefiv.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/67581971749.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16265835631518509785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+say+the+rosary+on+saturdayPDF 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_off00017154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17154 18524 bytes
SHA-256: 8c1a6a9decb4d6ea2b8317fbcdfcc198e0d58d3449bd0dde2cf11bead251f6ba
font_01_sfnt_off0001a189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A189 10496 bytes
SHA-256: 2179d81469fa02af785e81129005781735254d095ef546919eb92bf474a16ff6
font_02_sfnt_off0001b969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1