Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc926d43276f86f…

MALICIOUS

PDF

120.2 KB Created: 2021-09-01 21:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e1e3722f93782c8508d1a2c6c41aea1 SHA-1: 32ab9f5a9096f7c1e87b883cd8a2d221d190549e SHA-256: dbc926d43276f86ffa305aef06f2a52aa5a7f6d09d42a6d1eba9fca6fc361efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/47l8f93d6b434v1osoatp064s4/54423900987.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3559d90---berinokom.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/josisopojuxuduraki.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/pevafonotin.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/952a362a15af058b54a791616d0edf6d/14887910922.pdfIn PDF document text
    • http://progin.ch/ckfinder/userfiles/files/lufamepufaze.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/64943186c1b8a992ef3104b2012837cd/tenoxa.pdfIn PDF document text
    • http://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/34787266816.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/89162240080.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/84882236848.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xajibujabuxesawililati.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/20469199770.pdfIn PDF document text
    • http://hanleyresources.com/images/relagezuvuxuxemonexu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/rafojog.pdfIn PDF document text
    • https://egf.tw/test2/images/file/28382884233.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/nadamegasevi.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3eeeb6c7---40027810684.pdfIn PDF document text
    • https://mahae.hu/files/files/32089516729.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/39e55f2f8ff6143ab94fcf1820c21336/rixojowemige.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/90639342752.pdfIn PDF document text
    • http://esejsc.com/upload/files/dojagasotasajisipujaj.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cb7c4413da19fc63510d74be8faf44b2/jusaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=off+the+track+thoroughbreds+for+salePDF link annotation
    • http://irodori.kir.jp/files/file/bebawe.pdfIn 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://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_off00016d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 19780 bytes
SHA-256: e590c8fc4d1dd52265a70d3b13694a2b1057a3c9498a1e1010d03a7f4754a90a
font_02_sfnt_off0001b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A5 10916 bytes
SHA-256: ddd6b9637f9e92f2c997652d9c5c51c0574c8ceeafd33085a9accef9772a79b1

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