Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fdff3a406cbb68…

MALICIOUS

PDF

110.1 KB Created: 2021-07-20 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9395518ea588860058545cb5d50654a SHA-1: 8b3a79ef7ec45a3abf78a844c67e7cc83a032fd2 SHA-256: 78fdff3a406cbb686706c0d805b06f356bc2be940d62e8d163833a6e7bf54b7f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bbmeti.it/userfiles/files/58480783993.pdf In PDF document text
    • http://cipetbhopal.com/webimg/files/vexivexegutiruwaxejoso.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/hmbhs74uu8gopihc81ahpbmsd3/80255611536.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4f597b13---janubapumum.pdfIn PDF document text
    • http://qzgj.cn/upload/file/sanofudolopejapax.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/54760178104.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7068a6a7---jibusakomisixafezosewab.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/33e5df8879ca039b6259a93eaa5c4f6b/55514762423.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e1bb832e---xoneboriluretuzorunuzuli.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745e8de6366---69256882268.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rinovuxogi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/109b735ec772b17af571c65f502054c5/48291353473.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c01b3033---gajibumov.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/novemokosabiwi.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/lirewu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/491c3a59f182e057e04869fa496dfd42/68643078348.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/jabigivesekatenezadejesif.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00d009512---481726548.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7416f8fe3c239ea583e483e8480529b4/vovumuvowomagip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ee8ab47---wojumexewaduga.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/tudimutemewibogegud.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a3dusov9j90pp9bn0nt6gecji0/41041795042.pdfIn PDF document text
    • http://liyangah.com/Upload/file/27525268855.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8615d621d---33286135721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=it%27s+been+a+decadePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A54 19088 bytes
SHA-256: 76bb3c7962022d5736d91ec11f849d5bf91f4d47fb4d5b2ef4261c3286693b78
font_01_sfnt_off00017c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C99 10132 bytes
SHA-256: ee516f90c142b9af5ac84bdfab1915a660f62cdf8639c6f93e7a3dd8578c2635
font_02_sfnt_off00019370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1