Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e8dd0d1bffdf00…

MALICIOUS

PDF

89.6 KB Created: 2021-07-19 17:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5d9d287e1b028b1f7688f4da3e121615 SHA-1: a1a7262b0e276b7453e2b627ae77b29506b60110 SHA-256: 48e8dd0d1bffdf00a8269015ec98b30ba59661adefaae7e2653264df6781fb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f982a6720b---zexevamakipupo.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/390f63a9c499819b95a257856ab36c22/48172177703.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210716104225_2017002431.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946d464cb89---2778905925.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/jibasupazepoletetisupo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a898b984e---29160452100.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd551697b---wofateturejegefo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da761a4b4---sedilujeloruxufixok.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb396120222938cf4918c2ef30057347/38874402266.pdfIn PDF document text
    • http://freewest.at/pusedugajib.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h86cb1pkqcqpjlbm53v2h5ume5/xaluwotejopuworozon.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/cdbd6e66cb7db382b8367b2f8a256e90/43145505751.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d407e3c6834---91126820774.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a240746071e---40381951931.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c4eb1fc60ac58fdebe7ec71df88e4eaa/kewegaxumigi.pdfIn PDF document text
    • https://ghnservizi.com/file/63722511248.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c505e38745f0df611e47f86e9608bc19/4150587448.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/dujijixug.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6b073ea0---42519157448.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c36564ff---74671485184.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/34360272316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=thank+you+for+reaching+out+to+us+synonymPDF 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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 18404 bytes
SHA-256: 4cfed2701754419f8170ab950bedd356b71ba4ab2d1852d9a3643150c5b0278a
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 11004 bytes
SHA-256: 1265725792fd6fea861064fd6a76638a8118f528f1d18499d9b0e9fbb19a0318
font_02_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 1724 bytes
SHA-256: 5b68e14c25a8fd0333afc241be4cdd6da0a5133f0171feaf563e2df0cfb92705
font_03_sfnt_off00013ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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