Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d4544a5b1b8c93…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 05:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b7be6f18102533bda54ceaaff80fd2a SHA-1: adc5e4efe67e67092f450ceb9862a5f9106eb6dc SHA-256: 33d4544a5b1b8c93cf59e2a58175938a674b78ffd9f06e3d16b736c317a5eb7c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, characteristic of a link farm designed to direct users to malicious sites. The presence of external URIs and link farm heuristics suggests an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.cenlafilm.com/siteuploads/editorimg/file/mukemegalozuvutaxob.pdf
    • http://ipceurope.com/assets/file/56144123770.pdf
    • http://bisenzia.it/userfiles/files/69346606695.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347615887e8---gekasokazefemefim.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f101lmm6mreijb3il2pss07n76/11210222412.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d6geh38ubj0n3qrp4mk9d6cpq6/kexisipematofufetirux.pdf
    • https://nepalonetours.com/userfiles/files/kuwajujigekemexe.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/venegotomavalidez.pdf
    • http://badaranquehablar.com/userfiles/files/netitapiluvo.pdf
    • http://kientrucsangtrong.com/plus/files/57272608765.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/624c15fff6a9f677b6cf10237aff01b7/43097328045.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1a81e3b2---30284015409.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/kotajuzedolire.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/futiwiwenavokusokoniweze.pdf
    • https://tsegypt.com/file/8321787177.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/92444256238.pdf
    • http://sinorarechem.com/upload/files/limokerijegovajiwu.pdf
    • http://ch-yang.com/upload/files/kedir.pdf
    • http://eltdb.com/UserFiles/files/zigimow.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/vijexobonopidowemo.pdf
    • https://toolsatool.com/userfiles/files/lidojamesebesixe.pdf
    • https://thefertilizergranulators.com/d/files/jazavenakiruzo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+xenoverse+apk+download
    • 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_off0000b889.bin
9a11e02661b30a8979d5e377a47ff628e143c8c43f08b65ae883a6b03608a4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 10924 bytes
font_01_sfnt_off0000d1a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 16792 bytes
font_02_sfnt_off0000e9b8.bin
3725b75f5e893b248d2a4a96fd3e1f6e615b6cc9d7ff108f8a1acd5c5877803a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 15660 bytes