Malicious PDF — malware analysis report

Static analysis result for SHA-256 987f33d713a76360…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 05:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7cc51bc4502a60da368b54d660f7098 SHA-1: 39838e1559971cedb3c898a62384fd956bacb24d SHA-256: 987f33d713a76360faad21555efd10cd9320b2935b4115333a7f6368cd280f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a strategy to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=social+skills+training+for+adults+with+mental+illness+pdf PDF link annotation
    • http://web5gstore.com/Files/files/34700604322.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/movogiwedimomazunav.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/e37f4cp87ae6b9ir4g340e26a1/sumavoxabebawepuxo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xaxebago.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/funodorirepaj.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/qpklomfm6kpveedd4c3d3dk5a4/63735424849.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/20000824517.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/88885804182.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d07401e5e---78335807870.pdfIn PDF document text
    • https://mcsfood.com/images/file/molik.pdfIn PDF document text
    • https://yasacompany.com/upload/files/zevegotokavi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/bopufige.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a06027c0---munefunoki.pdfIn PDF document text
    • http://sb-78.ru/files/file/19767873024.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/28313085370.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/jojamabobumebutakoviwus.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d477bd6c2ea938877e5514b176b28e2c/41514969249.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zigubekupeb.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b5b53ba6---9867494842.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/58516620280.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5cfeb741---lizugujubirefun.pdfIn PDF document text
    • http://gabortech.com/admin/file/lulifotixizereposidiw.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 18104 bytes
SHA-256: 7cf1452fb07d523f9096f06dd74206a2e6dc0ac986680e8462c93e55dc77c07d
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 11420 bytes
SHA-256: ff985a088fc029cd1f99b8d6c528740f42ed8337dbf016e06156cac629fcfea4

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