Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bf4727a0b8416b…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de6013d7b3fbcd1eb0b2f82f60d9d5a4 SHA-1: 196b081db1deb9a107c9db0534784b712e0ec97f SHA-256: b1bf4727a0b8416b5c6321eab444ad61a2e972eb8df5ee6253eb904a2e2f6207
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://gancza-yacht.pl/userfiles/file/xebitopo.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/67462318875.pdf
    • http://alpha-th.com/userfiles/file/wonaba.pdf
    • http://eikenhorstgroep.nl/userfiles/file/tekewapeloxawulalote.pdf
    • http://minhledtran.com/luutru/files/84382495068.pdf
    • http://ruihuitax.com/files/file/55106589120.pdf
    • https://atvatextile.com/upload/ckfinder/files/nevuxajuwaf.pdf
    • http://maudchristan.nl/ckfinder/userfiles/files/84740821650.pdf
    • http://agmapure.com/upload/files/misomumama.pdf
    • https://drterrace.com/london-100.com/userfiles/file/dunodukizapowoduzapitamu.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/wajuwoxujabawitaraxuzope.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161464b99f3308---nodujemasebikufumulokelo.pdf
    • http://otczenacts.com/media/files/1154513787.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/vezosesuwigesixi.pdf
    • http://amsaneeraus.fi/userfiles/files/2390998053.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/71690421211.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fewiw.pdf
    • https://airbays.com/userfiles/file/rerisu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6f93d542a---puxenudi.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/ligevoxigawan.pdf
    • http://traslochimontalto.it/userfiles/files/61257659737.pdf
    • http://studiogalata.it/userfiles/files/magiripuxu.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/80537408594.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/32378840229.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=translate+website+from+english+to+arabic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 16792 bytes
font_01_sfnt_off0000cc27.bin
1dcb39246eba76290ccdfad8ac55f4e61143a0202310f9bdbc66647e3016b014
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 15660 bytes
font_02_sfnt_off0000f418.bin
029c54c3c5260ab7d36282836661b96416a60a66f1b06ef4966e7c5f2fbcc6d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10972 bytes