Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e60a169d5cab32…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 23:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40761fb244930e385b72918a6a39c1aa SHA-1: 626cbfe1ee5b57aed383c3ef1ccc3de9976fc3e8 SHA-256: d3e60a169d5cab322ec9eaf1ff9744698c53af570da575586907bf0678b3365f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=bosch+rotary+pump+pdf PDF link annotation
    • http://backkwang.com/userData/board/file/reronifitajobedugakif.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d650060dd56dcb3cbdd09d9cd45037ce/85246314591.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/wevipu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16091f473e7e7f---67506322891.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/55467920270.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/mixurupipisabujegewopop.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/konetewubulidotepot.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123a1dc27729---72871339016.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531161316456930.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2it31i70chkj7pta78ip7kjca7/wakalap.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d9871610---ponugekolibajeluxe.pdfIn PDF document text
    • http://ligneus.hu/upload/file/linulujuvaxem.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/8489544205.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/13586717436.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7e254df1---razotoni.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b838b393037---69182050168.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/dazaxil.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0tdafocspesc75koeosllq6467/numofila.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/mofarizejezuj.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/xuzekavoxased.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/45292690312.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/sufejovolonabiloba.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10780 bytes
SHA-256: 65936d32688dae08a9180b996a5aed641fc302241a086411542a76e474702f5e
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 17124 bytes
SHA-256: be184964e5689db8aec0044cb8e4a832c52f497f1446f74b11e99c7756d438eb
font_02_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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