Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ab03e982d894e2…

MALICIOUS

PDF

100.8 KB Created: 2021-08-05 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f5ce15743fa9a6a830e7ab1e7cf1023 SHA-1: 2a5ad00f3d0222931eccd56dff8a66a06585ba6e SHA-256: 77ab03e982d894e2189863ef70a8563f3f0bd094218908d3f54c7fbb10655d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/mozadedinominavuladir.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807d88ba0a---sumokovapomekuwa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf74e19ee---14084038819.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vularone.pdfIn PDF document text
    • https://bataretak.com/img/files/file/21212124625.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/220446bbafb8b000baeab417fc055f65/44677165707.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/27800481930.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515211624673.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a36d30f7---56195096918.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/movuri.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0eaa932676ab46314c2ce34a1b08c12f/jozazojupim.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xuvidukawumov.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb5d6b51e---30113365417.pdfIn PDF document text
    • https://ccskin.com/geektic/files/69945951597.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nonizasafarowiginupilup.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/luzivobuzotusotig.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/2035865917.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a45a76d18704ba352e5f6420fae9792/71623530715.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e2f0708b2---zigaxunowotimovutaf.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/gedekezawujiluwef.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6b3ce5259e686ae6ab6a0dee2bea1144/gitigawe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b6675196---kitivax.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/773c610d5165f8e3d9b7ea8a4d41444e/luwubafijusopud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+3+mod+para+ppssppPDF 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_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 11524 bytes
SHA-256: 74646bcc9586e703dd3e2579b8c09727ce5c43ac66ec63e4ac1d5fdf153c8321
font_01_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 17240 bytes
SHA-256: 32b3c913ecdfe1168c12eb268f92aebc23e5096d97c5e1e389df12759e2c99c0
font_02_sfnt_off00015d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17527 3440 bytes
SHA-256: 6dd5234781ab1bebdba5dc5951354f1ac0b02421781754ec4cc4a4aa4dd94f3e

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