Malicious PDF — malware analysis report

Static analysis result for SHA-256 3818b182dc79f829…

MALICIOUS

PDF

90.1 KB Created: 2021-08-24 18:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb121b56d9d8384e4dacaa682c8ba337 SHA-1: c70d403f82c79d960bd3d8bae6ed004f4981eef8 SHA-256: 3818b182dc79f8297ee21d400e90d9931c9bf1af0a1bc124082ae580fe434c71
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://adwokaci-pila.pl/userfiles/file/furebigiwiwetolepokon.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d9f34a93ee69ccc8ab373e0d91330a60/54277432624.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/14271246054.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/19338969323.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/sr6i2qromak3vmae7r23io8mqs/17067076222.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/118f4aa3cda5d149ee02503140f41afa/66932104787.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f7eaaac8ebb8ccb728ea7f32491e3923/42128529683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d405bf9fa8b---81460368983.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/30486578311.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/xilaneruworoxavuforikem.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kotokoresoribiferugipin.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd0e0316bb---8587913647.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/bilajiritunumenigosu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098762745ba2---vumifelipu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/fipijogufozeduzogudene.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/tuzanafekuseserurokilote.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sixewepuwoso.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tafid.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/80440288955.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9d5e7b2a05f63956edc8061a58812ca9/dadifufupu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1f3cc920---51947036777.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/wabetixatozike.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/juvifadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=find+hcf+and+lcmPDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 17808 bytes
SHA-256: 3bf01e9e3be157f5274dcd71ee261720b865701fe7440d3f7bc372247dc44737
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 10100 bytes
SHA-256: e0d52f6d5900810047d84816439c235e518b75988d874449cb6c3f48e917e788
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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