Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81364b7f847be5b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 04:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed9a3e6849c3c3ed6179e98f6a93dcc9 SHA-1: bf48f3e8087b3dd210e48612207d1436ea29b1e1 SHA-256: e81364b7f847be5b416f8d444485c8335efd6b63f6aa4c06452da62f97c75759
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--k1akb4c.xn--p1ai/userfiles/file/fovonogimibugusiwabu.pdf In PDF document text
    • http://netinflux.net/userfiles/file/90713224793.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/57973463153.pdfIn PDF document text
    • https://dm288.com/slicice/file/piwetanexepozebizevem.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/40094313869.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/winejewagumopedofitej.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0fee9a3e7c4104ea8850f5c3abc0179/peposananeziposagavujuve.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/waroginosuxuxobuf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7efd78ab06---72486191821.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b5545ad2---jefoza.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/kawezolufimaverak.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee26348b9ff---biliwapivasuwexidoki.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2144944453.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zunexim.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd712502c---85942051095.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/menuxenokajafatuval.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8756bf389a---tazovutasirifiv.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/2141965007.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/880b498c94b9f0efb11b1724a2303b27/jarijalokoludaziw.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mazajulixomosexagowug.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/32378022098.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/245b17d38edc0f0af726ba38d8562a30/pajaxesabe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862cfe12de---kusasare.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8d2682fc523f4818242bd2528a3a846e/zaravakidobelabiru.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b1d0b78c14a512f828747bedf583d040/falewimuwiledixivakonak.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddee75f00c4---fipepatozazogis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=laporan+pendahuluan+pleuropneumonia+pdfPDF 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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 10556 bytes
SHA-256: 632b715db5fe763c34e3228edfcb474fe6e142a27d670421471ac2fcfb665907
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 17256 bytes
SHA-256: ac096f201174c6bbb494f0d8472154c4c732a30efc672369e7bc56f398040e63

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