Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fb01109a1c159f…

MALICIOUS

PDF

76.6 KB Created: 2021-08-26 00:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70273f3e6db246e82527b56abfddc5c9 SHA-1: ef7579948bd89b1fc17240c4b558fc0f38cde654 SHA-256: 82fb01109a1c159f6b9e970eeb893d129b2d7c69dcbd2bde732efe2a1d8acfcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://restavracia02.com/userfiles/file/84830869857.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210516201914.pdfIn PDF document text
    • https://led7.ru/file/nexupiz.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/ganoraja.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3dff9b6935a96e84019f74b066c10899/14923868713.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/829bc2e96692b35537b10f9d8375fb2e/22553921759.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c13307cb---93004955386.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/96829617467.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/damesigi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611f3bfbede2a---9361435793.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cd46dd2064fbbc4be3a7ccdac92a2ba1/46705260907.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e403651934---venibenonukavo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49439404932.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kujedilogajukalogizebolin.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/sufudotizumumuwarowa.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210624090600.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/25537018953.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd850ef98b---87861118201.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/61100221684.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/bodakameg.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/3c7d93da9e54ab7ada0ef460e5018503/76364696935.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e677e1c6f---40094328798.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/24506989452.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/vakebetibajagogin.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd8e9c313c---85612233838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=play+date+2015PDF 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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16532 bytes
SHA-256: f06064746f195cdda80185032789902816218da0843cf3468cbe31b1c685d443
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10200 bytes
SHA-256: ced40fb84afcb66a8c6042784b1e589d8366ea8a4997e1dbfb9b7583aa13453c

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