Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa574e6d9f4ab24c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 05:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa5ff3561932ec655c2333fa1a8224b2 SHA-1: 20a0995a59e7a907cc15607b0e3e62d6d0624a9e SHA-256: aa574e6d9f4ab24c2566e2ecd870fa53d4a4d6efb93ee5fd85810c4c415c1f71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. 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 PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kueapem.com/contents/files/lifasibotitixiro.pdf In PDF document text
    • https://showdetango.com/bafa/userfiles/file/9161762357.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/vepolekiwijef.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/61251766268.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/verifokoxeguxuxewazazima.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/xivifudidobobanawufafedud.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/59560951301.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16ad6c326edbd0ac30e677e076f57524/bedifapidokele.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c38d67325f---23067984433.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903212137.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375093b6985---vufulowuzezazasaxovu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/33255355591.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/71876269687.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vju19e48v1s8r1rbt1ueg98n7g/dekod.pdfIn PDF document text
    • http://standardamulet.com/files/files/vagatonurak.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/2072454537.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/67157983323.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/zogigirorux.pdfIn PDF document text
    • http://arsvet.ru/img/upload/kuzimovibavojanuzage.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lvao3tqv9m6b4fpo26hntd97su/xozimi.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/kefovumaja.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/ganova.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1fe363469---dogixikupepit.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/nijisoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=walking+dead+assault+apkPDF 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 18936 bytes
SHA-256: a4be585583bbdd4ca40bad0775e7b5302605b794aaec31583cfe12674bf60c21
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10532 bytes
SHA-256: 4fcb5163ed88267106b3717714edac7da0b6d623ce83e5094c23bd514ad5d020
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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