Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b134942b165678c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 17:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e71aff3a68ada5f4bf7af70ed118f1cd SHA-1: c0d2c358e0c5f0bb45c7a4533e6fc0550e41e92d SHA-256: 8b134942b165678cdab2fc5da9b7e66669cd1595bb1a548ed3e9ca9724d428a1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a link farm and a fake invoice lure, designed to trick users into downloading further malicious content. Several URLs point to compromised CMS uploads, suggesting a distribution method for a second-stage payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a653d787a08---laxiroropaporiwibu.pdf In PDF document text
    • http://hieuchuan.com/upload/files/72810038892.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/betakifejutenepadetojaxin.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca097e479b3---rojogamupikunutigepefip.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b4087d0b---71252081836.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/nijegagolamolunelowe.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fafogijosaxutaduso.pdfIn PDF document text
    • https://led7.ru/file/49556154272.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tigukovinetijulovalase.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6a6f5c0b63fecb9062c89723f22d6993/98808460060.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/piforuz.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xofutujulaxakugi.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/95062263448.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4e638311---18521539392.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/semutuvaxojo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gavaxolo.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/lafelabe.pdfIn PDF document text
    • http://nessium.net/userfiles/file/jeruserusobufaro.pdfIn PDF document text
    • http://sns.hu/_user/file/79648392474.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce69e84ea9---xadukudajufajuliridad.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1e7664f23e225b1119a24b2eafab75b/dusol.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc15156fc---xedakabobew.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f55b905ae2---43111857716.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/bowuwej.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hc02pdik8bf0vcvtv6so5k73vn/9584144983.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3e2eeaa4c536bfa1e5325508db6073f9/fubuzezuxase.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/22839530514.pdfIn PDF document text
    • http://hak-al.com/resimler/files/93526640499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ts+salary+certificate+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10464 bytes
SHA-256: 5163a049d7ec02c63ee8f507f11f65cdcae115e9281a425bc7589d74f7608113
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 18360 bytes
SHA-256: c6bac82e2bb8df799e6a72c6b3a0193cdec78f80103ed04c6606363f57edf1b4

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