Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82c446682997e5c…

MALICIOUS

PDF

56.7 KB Created: 2021-09-30 19:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8da3ea4dd59d5b5ecfce45e901f8d120 SHA-1: 456f50ca13a0c4f5029399a60959ac8f267d87a0 SHA-256: b82c446682997e5c67281b6321ce36f36fb8dbabb4fce40bd3a35e68b0734835
174 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various compromised CMS upload locations, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly indicate a malicious intent to deceive the user into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://farmaciafasolis.eu/userfiles/files/zijamevibomupetaxemiz.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161351e804a32c---siriwo.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivulazewole.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9bd5b40b---79331677815.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/38391215463.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a55ad9e6af2e83b712c0ad28a414dccf.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/22417944826.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/93488973775.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82726907804.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zonelu.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/67575562973.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/firixapekejavajigojev.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/11552464066.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152a998edfa5---2030214520.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/54063478761.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/bovojoreribejupedisesediw.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gezawud.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/94550803004.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/volifakawejinenusujesas.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xizudowasevuvozazipifi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f11ed11860---vovatamaji.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/vatifinetowudemusu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aec31e846d7636bc7dd52c4130d5c705/39852765334.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/rutemutibuziva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=diary+of+a+supreme+gentleman+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 11056 bytes
SHA-256: 47ffcdffd659a97c49e3a17efcaf3781c98fc4b5e59660b812bba29f9ed15f8d