Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19334bb11628f53…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 19:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9320b19bcc9e8e5cf4ba966a10893e3 SHA-1: 0bd5b7e3a85848e257b9076228ef3963016c584b SHA-256: c19334bb11628f536ddf76e83ae777fbce357d7e5583aad9281412f6ad4ce7e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://uleshuzataruhaz.hu/files/file/37027435347.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fe2e7b8355229971398367064a44cddd/67019963472.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/55750624772.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/761925613.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210802_F72EC63C163C7FB6.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d116dd48c1a96b91e4e83703eba01b0b/siwarulugujorelitaletode.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/zotixisinepelodu.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/15594564889.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/500267568.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/91752137401.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tevewijesuboriruwesejidaj.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/zasutonotafoxisuzu.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/jenabonafilivimumivarogu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/00b953fb6e926da46d10ebdae465618f/sinolox.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c06cd722f---80729888690.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/2617654561.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/72418959667.pdfIn PDF document text
    • http://bptramptour.pl/files/file/87986345087.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609627ba98578---18694225515.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/rupozewajuzezivufobezinib.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/dabutexuzofob.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a334a8074d6---38032343060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=biffi+pneumatic+actuator+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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 16696 bytes
SHA-256: cb943965acc767bac89a58e65a85bd9f00c9b56d0d1e22869bd0203bf7b81116
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 10720 bytes
SHA-256: b7252e1de707bfc342d0057b7630742a488b6f7a58750fc9d06dbe1b57587b20

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