Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33eb0328a9870d5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 07:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10dfdac80608ac6a339841b428a80ecb SHA-1: 553cb6cd11b8a96ddb8827e217ea1f29128f4ce9 SHA-256: a33eb0328a9870d552711ca351efd7026a6de5c7606f4a105960a0c70b4adcb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's used to redirect users to malicious content. The primary attack pattern involves leveraging these links to facilitate phishing or further malware delivery.

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 https://greenline.bg/userfiles/file/vasezodumineledugu.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f71bed897b34813a969e89c594c2b02/xeverewewabomiwu.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/30668248328.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sidovazimibigeduze.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6da9bd63---65250548339.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/50772017184.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/datovimoj.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sebovivijanuxakunopamaru.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/fibabofizaviravudojidazo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/luvomusa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kexodidudiguwunisosodema.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881d1cac8f---48928842052.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/96547776266.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/70284911271.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c8e86c3cd6a0ec92bccc496b83fb5b03/veniwuwubazalawararoku.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xapasubimow.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/2939639380.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6e692b37---xowigaxibop.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/rapuzusuwamatuj.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nulenu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d470bfad---sinojazipugad.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/suzuvuwelisozoputinujel.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/jazisulajadeki.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf8a3a20d---totuloxajonime.pdfIn PDF document text
    • https://marosme.ro/hirek/file/7880853525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=small+pdf+merge+filesPDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 10596 bytes
SHA-256: 8036a6f0342356e79541c2a2594f3bb2db81b145a85c40837f3cd5ca80e7b205
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 18172 bytes
SHA-256: c216216cbee368a3a922d053cf14d435e74375648981eb7cd2594477e6ccd577
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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