Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b78decb4cf15d6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 17:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d39a387c1bb7f04b2875951c9777299 SHA-1: c7cdd356ffdcd31a93de111384a88ad1157ac158 SHA-256: e0b78decb4cf15d66c59550a54e3fbc0a3a56f16b69d3114c16cf88f180e3861
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://pistant.ru/uplcv?utm_term=smart+home+android+app+source+code PDF link annotation
    • http://alacarte-husum.de/userfiles/file/43413502529.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbaec10d34---99022629526.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/jowadegajilubujewopi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/36957269383.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/176736837.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/21394062051.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zoreminokateb.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/79843377386.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tirivufelakata.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161449498b8710---62571771715.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5907c2e75---26428246915.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/85272059317.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/pekagum.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/vunetejenepuxixesen.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/83486102650.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/87344673333.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c13c926ab---raxokezobetejudonemos.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88977594466.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/moxisazisepob.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/86006360430.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/55814542384.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/gubefonag.pdfIn PDF document text
    • http://byecook.com/ckupload/files/famigasadedavejajiwane.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_A0C2BBEB5BF74092.pdfIn PDF document text
    • 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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10908 bytes
SHA-256: b8a841729ff6316c8769a2bfd67b33fdae062b1444eabc9bd2b9c0a597566559
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 18452 bytes
SHA-256: 43980189429dfec0086e59592e258ff21420e5d6784c64fc6ed2611bd201bcdd