Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107fd930d4723fc…

MALICIOUS

PDF

84.7 KB Created: 2021-08-08 21:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05f18fb7917c34a03ac060a53f545a11 SHA-1: 839120a2b70a135e1a25a8c51e7e01e81a1a0c42 SHA-256: a107fd930d4723fccac0c1f965b1f5bd7918a22f0824a3da91b2bf166fc814be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous external URLs hosted on various domains, some of which appear to be compromised. The presence of embedded URLs and the overall structure suggest an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=how+to+reset+my+samsung+water+filter PDF link annotation
    • http://www.jindatunnel.com/up_files/file/movajogogifek.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/77740260990.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/71462965776.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980f18b0dd9---jufobovajejupivez.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079904d09a2b---86297640388.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95c7dc4cf---fajetalumepafanizawuve.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/makokavu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/82527320112.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/17681109792.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/957835367.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ff34fcec---18494554167.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/85vvtnnai6inktjvasvnq8lmvn/58049222480.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/ronupanudufubakijaje.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/68857112598.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/mabexuxakometumer.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/1f11c521b3811dd1172f46dd11b2aa31/vewadukopunebemazavifigiw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c743cdd5393---42626344318.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4081a14c2---matejuxotawuxi.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210717_1737B8466B7ACA6C.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10848 bytes
SHA-256: f8751cbc5e51ed6b0e3c322d6b9adab63f529e79bbd60de4fcc18ba708140260
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16744 bytes
SHA-256: 04f26b67255731f82702d4763ea75014da30c9eb19a282e94b87e3f2302514fa

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