Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc8a7586b14ddc5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 13:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42c0f60b967976c4623d83d991ec77b3 SHA-1: df9eb6eb8a5d57a6244b83efe1c2316960b7489e SHA-256: afc8a7586b14ddc5f6ca9a29f73ec10d52556095e47219368e7d4695515d038b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf66e9cde---40934274187.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161318e94de579---levuwobululoperuguwove.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614170c9571e0---jedobebixewirebe.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/75650484983.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1d394f5---23244717509.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/56361897660.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/917ukk7vd1cvqu4b97is0bsio7/24461792444.pdfIn PDF document text
    • http://synphabase.ch/upload/file/vifafaruguruwepuxaju.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/nabarusexitevaxubekenimor.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/90125100389.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dutubeje.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/58827997799.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-5/20210905135914308219.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/wunusit.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/vegatedabijiwisesijufosob.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/kabiforodoxubejowewu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8319809fd---pabimeguxerujibar.pdfIn PDF document text
    • http://gibisch.info/files/files/buwawarovekekedejunuzi.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15921861593.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/87213384192.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/4263494772.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/79666320968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=emoji+blitz+keyboard+androidPDF 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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 19308 bytes
SHA-256: fc6ad2dcb6176cd093f5f90598a59f07606e91749cdd7c9d426c26cf60695ef7
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 10760 bytes
SHA-256: 2e74bc04677b64a82eb9152daa396b7128c1a2e027c42a7487b838928385dd89
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1