Malicious PDF — malware analysis report

Static analysis result for SHA-256 272372a2f4627ae0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 07:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bd7326890e6b88c5b68f0bed2607a3e SHA-1: 4c21e74914fa279d33d483f31195d9aa6dd2acbb SHA-256: 272372a2f4627ae0b25cef48541e8c472730bcf110acb482bbaebaec503ec3d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://patrick-jardinage.fr/ckfinder/userfiles/files/nisigovisusipevebomijaf.pdf In PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/73568739789.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71e2eca43---nolumalarusowakuj.pdfIn PDF document text
    • http://safarang.com/basefile/files/kaxodemoxe.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/nolafomitatozazevab.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/1272990537.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/wajokumases.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/42965254630.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141635b44699---kitezususoxuvogamomuxanak.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92204021387.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/tifejakowituvex.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/nodutasisuxavato.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vawibaxiwelidagiga.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kitidosaniwaralu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7djjq2f64jhtc9fgb1b37q34b1/tuzudejiju.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161492f090ad9e---22342613052.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xetoraferezavejanomi.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/duwenetiterakekoto.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/delivixeku.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/52226795924.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109041207269187.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/15284070237.pdfIn PDF document text
    • http://dfanchem.com/upload/files/32373377295.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/839a635f1c809a317c95c09641f4493a/4525546816.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/11080267824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shooting+games+pspPDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10628 bytes
SHA-256: 1abfb56f0c8eb3e20eafa41cccedf2311ab4b14d9fc475552e6cdcdab2deef93
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 17444 bytes
SHA-256: 110afbe6837e0e7ac2731fd4da3cf12fe372c50e15f7772d1a4e292579626f1a
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1