Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b7fbae003c0333…

MALICIOUS

PDF

93.7 KB Created: 2021-08-05 19:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3fbd7afbce1f52fdcf90f163cc709639 SHA-1: 2aecccddeaae17145af682f7df6bf2d9e216bdf8 SHA-256: a7b7fbae003c033318bcf561c3e1623d05d78c5c1a915d9c4e50813b2a83c215
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8217

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://phongkhamthienhoa.vn/images/files/35712969928.pdf In PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/duvarunudes.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/971f2ebe8102f3ef50ff1bfc7498cd73/xulabosinivolapeku.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/84711303699.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/56349967986.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f70eea4---59718867069.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/lapimeme.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0c09ec36---remavofoxasukuwenube.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/vudutiziwosurawitar.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc3fa3f4f---jatajifobolo.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/39069128370.pdfIn PDF document text
    • https://fotovipvercelli.it/file/6164929038.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ced79a9b---tuzesekuzunafekifagemenon.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d29d592f---18071164800.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/wudogudisutat.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fd47a4c1e3655b31a7b89c320ace08e4/kumetisibawuberipowoxok.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/92107923066.pdfIn PDF document text
    • http://technocom.pl/editor/file/1946878987.pdfIn PDF document text
    • https://datajournonepal.org/files/94109293350.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c0d7d8da5fccf8fa10940948d04d6c28/litexitatamet.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/xekesubevejatuvegugafepat.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3slqdv107q7lbucflgtpjj7i4b/tawupel.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50c1bce93b---88970110362.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/7822973335.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f65897fd9---gilogik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=suffixes+for+nouns+and+adjectives+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000155a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x155A5 17972 bytes
SHA-256: 391e2b8ecf67d5a2fbbc872e13d53f88cc719b49115baec18ce73c108cb2f706
font_00_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 11040 bytes
SHA-256: 16ef48d520f5959dbe94c35775f52d91361852e2a77842796243215821df412f
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 17108 bytes
SHA-256: dd37999ebfee66c3085261df3232446850a5b770329a1cd1123abab5c463b04a

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