Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b674443525f3a4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 01:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02c9e49cf11dce0a54f97615a3bcbf8e SHA-1: e1e691b34ff4986c5d98f80417265ce01130c801 SHA-256: 73b674443525f3a48fd66e6b9a700073e6a7c77e6ed0579a2058af8ebb54009a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+unlock+samsung+galaxy+s5+pin+code PDF link annotation
    • http://sgrappresentanze.eu/userfiles/files/notoxekuzugoladilogizaxo.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/rubofu.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/ponegemisivuzutotile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394135c5be6---pogikofikibufewem.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/lejoluwaxovodalelomifebaz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f618b93eaeb39d8fe62d27c03e3cd50e/vakiwakobupilaxozi.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/22798562465.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614663477c0ea---80972133499.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52571404530.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/72451959642.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/33328241120.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/19001040778.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/90051230975.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fefa863b---51149645808.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/93197410789.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/lukaf.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/peladeg.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/85667791512.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4957588503.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tukivarine.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/cf6b8b18444b788b0abb4ee5d2df00ea/76139043274.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/32885073572.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/68082290317.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/64578643598.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dunipewexitesuzoga.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/50061578173.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 19060 bytes
SHA-256: 199754e060519df5f6b033c8bc43d74905eb62085fc2f6e052d696e73145ab85
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11376 bytes
SHA-256: a142a3607de2fc0f8f6f31c81cfe6c7360002cf459c9dbf565b4b8cb505be17f
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1