Malicious PDF — malware analysis report

Static analysis result for SHA-256 e481dc1b91366fa3…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 18:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695fa79bda730f439a9c37e7c0f97d7e SHA-1: 6a588fae8bf95fd70145deb30d1346fa86703815 SHA-256: e481dc1b91366fa3dd0afe9823fd736821ceabe142101cb32120b51ee9cdbd22
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised or disposable domains, suggesting an intent to lure users to malicious websites. No scripts were extracted, and the document body was unreadable, but the link farm behavior strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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 http://islandpointfl.com/userimages/xuzujepiwaduvimisemin.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc32491467---luxig.pdf
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/841c2d325dd210fbf58c6be22a752302/nodugekazakorinikedidewe.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/datevoxisi.pdf
    • https://vanphongphampmc.com/upload/files/madigaserunikudavav.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf9ea4a76---91303194474.pdf
    • http://vhshf.de/File/vesaxa.pdf
    • http://domholidays.com/userfiles/file/dabeweneza.pdf
    • http://circuitoinsulargc.com/documentos/file/82480355157.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccf395e71---9893446584.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1a909d5b6523d90945476ef3ca31479e/78058048017.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/32d9780e62d14ae940ba718b16077d6e/wigenovu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gspm40sunbi6d9s8r28re20e5b/rinevapabunazolefebenab.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ad9441f459f1cc27d233c7411725cf7b/mibudikumaw.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f5b057ca---bidarakufikikukududuk.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/35519132515.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429042112191.pdf
    • http://gancza.pl/userfiles/file/pejaluzana.pdf
    • https://musikkursus.dk/userfiles/file/21087905340.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7a6b0ae0---tifide.pdf
    • http://messtores.ca/fck_user_files/file/xagogu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=causes+of+biodiversity+loss+pdf
    • 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_off0001124d.bin
c44e593ca2bfb0fa1aa53ad002ac37f478b14c990b5d3d5c3ebdb0cee92598f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 10840 bytes
font_01_sfnt_off00012b48.bin
296379f950bab65f731c5ebaae7683604d8ed68846b1133db5d9dbe017929763
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 17096 bytes
font_02_sfnt_off000157dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157DD 16792 bytes