Malicious PDF — malware analysis report

Static analysis result for SHA-256 29abf25f0979b583…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 07:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c46e22c2b08e04f795307a9d987a9428 SHA-1: ba2c686c39b73e082f42be570bd2e4407967d7c5 SHA-256: 29abf25f0979b583e7d1eef7f919989d99d3d43ad26dfbca4f1cbcdeb7fe3179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The primary attack vector appears to be a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=dual+audio+video+player+for+android PDF link annotation
    • http://investgeorgia.ge/userfiles/file/zikosowebanome.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/4541076701.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/lesisuduki.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/62762678738.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/givajiritozarevunewasino.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1bcd6e013b7b754e0889bf7e65e6c082/63351158538.pdfIn PDF document text
    • http://melabo.com/upload/files/81804428805.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/47040969803.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/lififakubufujolezipopu.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/poligigojavaj.pdfIn PDF document text
    • https://europartner2.pl/uploads/losojo.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/75452596046.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zizibelo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387508e1b8d---20985724564.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/nedejoravig.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/66781598519.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/16215236451.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/62185307526.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109100635044463.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/tazow.pdfIn PDF document text
    • http://wsm.hk/images/files/mopulotid.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/38593085631.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308faba575c---kafuse.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/78685485495.pdfIn PDF document text
    • 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10508 bytes
SHA-256: d1d2e9b1d262529aa7a72671e879e0b88a38a23d0f1228ac51e69bf17c29b1bb
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 17968 bytes
SHA-256: 396e80fe5c3880c01fe40db9d9474c2653f2743ab54ba6ec236c2ee1ee21af11