Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dfa3281176ad2e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 14:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d00e210c67b269de7c1abd34724dbb79 SHA-1: f4805fa270e02dca3d770903f7f12a1b48a2aa2e SHA-256: a2dfa3281176ad2ef0dc95730ba4dedf7c7f80a374690aa4759cbf490229dbc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://specialgarden.ro/userfiles/file/nuparukit.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/voregaj.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vizogivowenizir.pdfIn PDF document text
    • http://gr-chem.com/upload/files/4129213723.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210915155444.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e4c4f64e---76880749506.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24167528b---98003095239.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/85456525883.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/kemodo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d8f91288---82625820159.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/1914264031.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/fazudigojoviwarabo.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/62305752753.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vubigupesufimimejelekes.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/70639117482.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/tefifejavixizisenifuniwen.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/badoje.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/mewipovufipavawi.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/60057530311.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/74958377089.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/37369781061.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/wiwomexegafavogazewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+not+sending+picture+messagesPDF 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 18012 bytes
SHA-256: 5c16abd8a02a5f1584b022c273c414b0459010ded731bd149fa3453d319c376f
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10892 bytes
SHA-256: c897b99adc16355b467d32dd1653f3b817a18251debc7eee1f463dcca1b25e97

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