Malicious PDF — malware analysis report

Static analysis result for SHA-256 41408fb47ad3a5ba…

MALICIOUS

PDF

65.0 KB Created: 2021-09-01 16:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82c7b97dd3c2da211098cf63021bef14 SHA-1: 95c705362f393a55b1cf49d8d719bf8f94e92cf8 SHA-256: 41408fb47ad3a5ba2e984da11549d8fe86d54fac43f60b58e2c08ca0f9a1154e
154 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many pointing to compromised CMS upload directories, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The presence of numerous distinct hosts and the use of UTM parameters in some URLs further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9313

Heuristics 5

  • 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
  • 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://teraval.cz/res/file/sufolemudubazodexijeke.pdf In PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/4t3umokrte7opnokd564h99lat/zinovonawisiroxile.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68f5ae22e249ec882e033948f1ba296e/dogidodidafuvimi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013d9bea0b---vapenebotaw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/152e004e1b9871a778f517cc09614887/96084020437.pdfIn PDF document text
    • http://altinay-law.com/images/file/vejenax.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/tozam.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/62162512142.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/qsvup9hcb8abmfqusbr959nn96/82913369460.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/78435009361.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/43099542707.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2a394d224e5216c4e7a3b37be2492d0e/32929765109.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/47988534555.pdfIn PDF document text
    • http://bronia.org/userfiles/file/gobemanarusowow.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/loniwuberuvomipaxanekipiz.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132f346ca0d---91106411060.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/dolatabidujukumakozefo.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/44814692691.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c18cd6e6db13607610a77eeccc089cb7/kekug.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9agldlme6mbvmbnvmtj51jcq8o/11294171376.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/tokigubuwifotizinevome.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/woduzipikekov.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/65843745453.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610478c765eae---41189385893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=at+your+earliest+convenience+alternativePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 19684 bytes
SHA-256: e83f79dc51a8219c03f56c9d97aff3dcee4a2e034bce310a201de7d7a144ad20

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