Malicious PDF — malware analysis report

Static analysis result for SHA-256 8085af6ccee4cea3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-25 21:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd14415ffd37ccfc83dd93305e748253 SHA-1: 548068e9ec90104acab4ff2cf430152a69194764 SHA-256: 8085af6ccee4cea3de35a441cf4eb357646a35ec75016ba9996fb8cf3f606708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, redirecting users to various URLs, some of which are hosted on compromised WordPress sites. The presence of external URI indicators and the nature of the URLs suggest a phishing or scam campaign aimed at users searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=justice+league+zack+snyder+full+movie+online PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h8qp4foh2q2picenulnadd8c2t/vibidigupisupobosewogalav.pdfIn PDF document text
    • http://selidbe-beograd.info/files/sidagusidopogubojug.pdfIn PDF document text
    • http://domainecomps.com/documents/files/72220899172.pdfIn PDF document text
    • http://vodova51-53.cz/files/jopuwurizodigeperobapig.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/tejilozavulozi.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/wunugofizevimabofede.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/zazasikug.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/jovojilawalazofit.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134491b0da08---15971291450.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/41858128801.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/kifukumo.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109131918378267.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/62650726160.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/2860077730.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/46641675927.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/41189113369.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210918121424.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/xivafivedaka.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/18784966669.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/fowubagat.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1effbc58587f49b6da2431065d2910b4/66219877930.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_off0000bc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 18884 bytes
SHA-256: f30904495fc2dc1858410e7187d96edae81424a957ea385a6e415ffff01c2844
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 11244 bytes
SHA-256: 47f9f36c4cd168fba9bf50a569b39252e8004b7865d71485ba381516f0fa24c9
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1