Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9e9afbeaf465e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 11:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d28d93a1ac744fc250eb9595e8df1046 SHA-1: 54edd76c274b01bb7c58ebe4732d42ae45072477 SHA-256: 33a9e9afbeaf465ef55c01f73199ef86e15d3ffd6865647c3271ab07241449e1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous external links align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=castlevania+ps4+trophy+guide PDF link annotation
    • https://kaptenhoki.info/contents//files/22537941554.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/78620212568.pdfIn PDF document text
    • http://chieucoingason.vn/files/bafufujitu.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/vazuxajug.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8bec46b7---23758667624.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9r5feth2p44de2r32ros1o3jsk/58931133299.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bbb9e719---42104770444.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/930674193.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fpdjtlt2p4nijhh62a5mv7n8na/40537298670.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/63878738075.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/342540faaa6c50f363f06bc263b2f2b7/lezosibikivedajefi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vimedibotixolemesa.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zopesarawowutuzupopevub.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///44317060546.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/bugivomojinuzefopobekiw.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6844e41e8768f82236e340df66a31319/nosigoselefubajefevu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081185e5ffd2---midor.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8992bd326e180b207ae8e2af3ffac658/53869155915.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/satumareg.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210803_223713.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b62575bcd---79380825017.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/80091678693.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d962fe4816---mukobubuzonelumijidov.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/6701531278.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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 18272 bytes
SHA-256: 6bd48dbc4e7df6daed65c7f9dc01db8b7bb9d34b9447ee293a75e76e90af8f8c
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 11060 bytes
SHA-256: 5c075ba38726e1177140829a27df85902009b1bbc63050a3db418a8fc1fac2fd

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