Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d59ef9b8f1d83d…

MALICIOUS

PDF

102.3 KB Created: 2021-06-26 10:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc03caf18b37c832127618589103dea4 SHA-1: 75bf90b5bcca8716a28468699a5f7c950d1b88c5 SHA-256: 19d59ef9b8f1d83dc79c326417e49dfae14225742ddfe10c1e6ff1afa4d02655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to lure victims to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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 https://smidgel.ru/uplcv?utm_term=tamil+daily+use+words+in+telugu
    • http://billsky.ee/files/file/43339598431.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/jokadev.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5281edd122de3f7898090d4b56ea3cfa/19881863234.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b9fe2a9f---jomepabufivo.pdf
    • https://accuratesearch.com/userfiles/file/sulajerobi.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0f3a011c---niwopabifuwaguf.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/360eee37ae8df3f2692ba3ebad4f2054/suwojereguwoxadage.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a0b8d2b4---lemazemasajovupuwuguzi.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/9134874344.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/3789288627.pdf
    • http://studiopignotti.it/userfiles/files/61117122616.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b06b2300---99739392047.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fc35dc60---21482750863.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bkmd9oel4ddn4hiunbds02cq2b/51622232831.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090993ddc63f---48955495289.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe75731bdb---penujono.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a50a83dd---pamufapu.pdf
    • http://icmasistemas.com/userfiles/files/62621815853.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f63c6d627---gakemiwazaliwokokojo.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/02b8f2b0b84730cd654d2e717836802f/35141138061.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbaf3053ca---gibiguzibekutad.pdf
    • http://hifitness.hu/userfiles/file/losefalibazijegivagapeta.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/44ad89bb0b126de12de77e974a182ce2/fimopukifirugirinonufo.pdf
    • http://pcccmiennam.com/media/ftp/file/33264419932.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/3ce8d6adf7186faee43f0f2b0e00dfd2/gurujekixakawuxabufutob.pdf
    • http://terezmisszio.eu/files/file/60183398519.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/folopaxunu.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_off00011ad5.bin
f2fe62136ebc8931abab6a97c9b99458b18feae6a743af22c155049a2d234240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 10856 bytes
font_01_sfnt_off000133c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 16792 bytes
font_02_sfnt_off00014bd2.bin
a29cc5b79196132a3b7ad80d72a0e9daabe71633f31ea639d4a03b0fcf095038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD2 24972 bytes

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