Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ae89bebd999310…

MALICIOUS

PDF

108.6 KB Created: 2021-06-13 18:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b93c422975d48c71e01c6e30cb00d2eb SHA-1: 01fd1ba7e6c09fd89c93cf2db5a4b7cbc84928d6 SHA-256: a5ae89bebd999310ce3b085e0a9b695423e86fe9a51afd60a0e40e89b19d2bbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=english+nouns+verbs+adjectives+pronouns+adverbs PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/12hs0lbv97212r140622lnvjve/kalakul.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qsrhv32ficuidh5oaot6c4s1q0/wuxezotesitijarawunid.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084896e0b38c---320490324.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df310254a---88698386102.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbb289a65---volipegovejexunij.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b0a59bfb---vomevejobawutujowoxo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0501a306---17519988262.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fedakelefasepipupu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac76f5219f---xozobazujelavamikix.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/dinijixadakamufegotejusik.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/68342eaa868ed2841a9b9bacdffa159f/polexukomavugereper.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/40457209304.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/831675110.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/886813d34483a9f5139b8c9411072c93/26540425001.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/baf7180fdc2d25a98926438395880d65/weged.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/470f0801d4124ae151b87ed2c5bded12/visebidusuwivuxur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 7712 bytes
SHA-256: 4b6b79b04bea4c6ff7d335909907cb018259c0a2cfdbfe9bb753fb1cd2e2760b
font_01_sfnt_off00013f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F91 5568 bytes
SHA-256: de86d2d9784c552f41997f820b0da76051c5699cf0e2ccd190232711cef58de9
font_02_sfnt_off00015280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15280 3352 bytes
SHA-256: cb6ee55865c99f54b62443295d3a211438acfca09cae3d3fcd89fcfca288bc43
font_03_sfnt_off00015fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD6 19592 bytes
SHA-256: 2117c5fee574fc68e20e8ae95cdcca73cf093ef9e2bbddabcebefe7cc5e28421
font_04_sfnt_off0001953d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953D 3848 bytes
SHA-256: fd5b14c39e4fda13a1a6c3a59dc88fc54c27918ee2a88e09b6b2a1a9f5e4f446

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