Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b32936163b01f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 11:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5c4b5ed5eadf0a1d85d784b1b42a866d SHA-1: 6e36996ba22e3f60a98b976358e477023b887f7b SHA-256: 430b32936163b01f32fd7e6166b273c2d9db413ed45cec557070df0d201c3af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://montesantangelo.it/files/files/jupupegovudemogul.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16086106117f19---wezazimizotunikupogokebal.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/79020082357.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/m5ebdlm60d8vcjidbsoch55632/vuvur.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/44976409402.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wabamilevopawinizesijakes.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/rawedijujelilivudedelibo.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/kojomenibilafug.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/59962332902.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/mawavarugoti.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/72154559949.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fipujan.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8q97f8qbglbse8p013nnktjqhu/28452660494.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4fbd3524786f86fc48a4753ecae65c39/kukozike.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/e5odvtq5b4q2lekcubqlkc2mhf/92893135484.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/zipawovubegemapozep.pdfIn PDF document text
    • http://melvin.cz/data/girovanolujimutavo.pdfIn PDF document text
    • http://wp-kancelaria.com/userfiles/file/dugizuwipe.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/27589901109.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zunegekedibumod.pdfIn PDF document text
    • http://canvangdientu.com/images/file/22384871773.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oe50ehhla5hickar3vt1n00dh6/zupogevovofogonexewafumit.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/17d69f51725ca7ca67840eb37b39aa5f/lefew.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/rebafuxepareraxugola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+of+acarology+pdfPDF 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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 17128 bytes
SHA-256: 6674f346897fe47f8c900fe56d713418e26a5270c4650b08d6e0b82496e581ad
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10512 bytes
SHA-256: 13b0d79f6e53a2119097ee01f71a9fa86ec31aded05a8b09cfe14bfcaea8dfa1
font_02_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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