Malicious PDF — malware analysis report

Static analysis result for SHA-256 245ea8ead1cafac5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 02:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4b29abaada1c8b0d00e0466ab751e788 SHA-1: 2e04699b8912a83e031791f5ff80a04147b290cf SHA-256: 245ea8ead1cafac5239e0fce14f6ad3fc4c1e89b4e345654c0ec0496ac21d6b6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user clicks, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=pokemon+fire+red+hack+gba+download PDF link annotation
    • http://delta-serwis.pl/pliki/vonapexunogez.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vebopasejesenonasopo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wutujalegivuxisuzonodaxid.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/67344211475.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/wumasovopilij.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/tewawaza.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/2952718990.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/48224085324.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/82512995487.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/46024303282.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210913_084746.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/pozewubopav.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9a40ca1b63116ae73d5163668661f828/11239996727.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/dinanilupepulupejonosume.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/35805154377.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/joxugopaxo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707d5d6d31---banibirirurek.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bee992b3---10289284914.pdfIn PDF document text
    • https://semut73.com/contents/files/2577485424.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/50975801531.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xeloke.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/7933785468.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/77570866236.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_off0000b538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 15472 bytes
SHA-256: 753cf8d510acf02237bcea545f67257412da5fe9ed50c50d94b1b5e9625bb95b
font_01_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 10976 bytes
SHA-256: de9bb846c3ef37fa736c9eb0e937c721ed9079fb57ca8378d863368f8523e823
font_02_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1