Malicious PDF — malware analysis report

Static analysis result for SHA-256 067c3a967f103f28…

MALICIOUS

PDF

84.3 KB Created: 2021-07-28 09:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6288c6c13405b38e82c6a78034007fff SHA-1: 3b1870c6ad7d4087c0d1a16fada1109829fbe40d SHA-256: 067c3a967f103f28dbe55b122a428a019a922cc78b1b909bb72fd1c8d66eebb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised websites that host further malicious PDF files, likely to facilitate further infection or phishing attempts. The presence of multiple links to compromised CMS upload storage suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mm0bg0bg2gj3mjdur77ggv34h7/54774187379.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6868820ee6---zaliguxubozeduruvix.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/83452708305.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210717122442.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/52052363513.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/mowudagefiden.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xuzusemozapataxonutuk.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1hqf82noqlegderegdpj862u22/wotafa.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/13089354639.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95aace9e62---pezakot.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/86306722998.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/vutusalap.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6c6da372b9d1c6f2fd52949be993d719/xexonanetejewazemo.pdfIn PDF document text
    • http://ruresept.ru/files/file/vozupaludujerudera.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nidibenuxamesavobipowan.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/aad45a5907a25568e032bce5dd376303/dovufipizowog.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wabegurenitede.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94370626185.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/sorasijemadedewilo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8f563240b6805204ac15ae85bb67eac3/kuxuko.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/44227530111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=instant+self+hypnosis+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 10792 bytes
SHA-256: 6bc9d561a14f813a343924168f7e58d1ce8d20bde048ef61713f9fed8b6b6574
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 17628 bytes
SHA-256: c2c21dd6a3a599560818203637a82904f4a6bd39a97c42cd68e7b0bbf67489bb
font_03_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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