Malicious PDF — malware analysis report

Static analysis result for SHA-256 299bcd604d0e3120…

MALICIOUS

PDF

101.9 KB Created: 2021-07-02 07:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e1f17cb888e545d201b530329b44dee SHA-1: a48b62b3c3db1e4128659ad0cdb13e1607703a97 SHA-256: 299bcd604d0e312076031ba3096010e4676ed826e2def966fcd99c3f9363bd3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely lead to phishing pages or further malware downloads, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=csir+net+previous+paper+life+science PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1e6dd021---xexazixupugera.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fbbc94fce726b1059fc6a608f2cd06be/junabuvuwipilan.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/1ef96346e3618b7a3d5ffaaed8e6a7fe/58650325146.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaad634544---88845356056.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ee13bf588ef2f3a3211e26c28da6d407/junonerasasupodi.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/penajiwofevijuxi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/93174d8239ef9078e3e41639aa827436/wozima.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef189b770551a8bf5ba908cac4527fcf/kinovutazisuxoli.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/5b271734971e170906774f132fd5bdd8/85981320901.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb914388e3094ffbe0460940a1d62/betupujupinefoserokadix.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/25755649593.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/713b3de4ad3fdfac4e4a7da69dbbf561/mexuxofevu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/haf8l0t739eihb6fot7frv3ia4/tobodivina.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/74c34f23ee70241219c7f8750849397a/79253593094.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7eedea83---32276722939.pdfIn PDF document text
    • http://olympusflights.com/files/files/zerikonateloroxojokamesuz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/qn0d9ecvtdu683pkv1jk8qt25e/45751990896.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/99334449500.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/52702428416.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afde80142c---lokamob.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nilubevazada.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4lpoc5d1e9k40bl6nsefci23k0/78094055985.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2173b7a882---zenijogum.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/2798920949.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/jodaditatuliwafunuvuguji.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ac96df18---78274019543.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_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16832 bytes
SHA-256: b8ef9d26bc5e8361a661bba66738fb39750990bfe52a2f4766e96c42ae9d269c
font_01_sfnt_off0001593e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17155 10668 bytes
SHA-256: 4863e6059f06beda04f65f43d4fe22201c7b93a27943b56c1bf008ee84898bc1

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