Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a75cac7cbed74b2…

MALICIOUS

PDF

84.0 KB Created: 2021-08-13 04:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 66439ab6a1f564eb4941fb30e015281b SHA-1: 027d35027975497946dcc2ac8e1424e1d434075d SHA-256: 1a75cac7cbed74b2e4993c1965bd98c37b6ab1b96dc3acad35fff8306d871f36
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. Heuristics indicate it functions as a link farm, with many links pointing to compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

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 http://portalinmobiliario24.com/uploades/fckeditorfile/bigapavaxodilod.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/s0mu79h9qdkm295c4pohoil65o/18657332612.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6v556ikk8liiui2gip2ctljkhn/76528949501.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gusikedixewapuvanizifodof.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/gfd47nefejbos07gfqnjr0golt/tesulobabud.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071818ad23c8---sananunireza.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/50306767732.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/duzowan.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a87a305ecb---90326612282.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/58cac9063fa66826ae68e375dee9089e/jolefidawitupapenef.pdfIn PDF document text
    • http://builderall.info/userfiles/file/64448459024.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/65584828985.pdfIn PDF document text
    • http://learningkey.org/userfiles/59792187264.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/tepewi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/316f4ebe41527031aa353c3ac4e4f6da/dopewuvizudimotebozaput.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zusubenamuferikad.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/gopijudabaxujivuso.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7264a6d00---junemuk.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a5b5d1636cbff91bb43a2d13c4fd8348/45693320535.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/32010621795.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e71e96554---55941035778.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/33030368460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=microsoft+sql+server+2016+standard+edition+sp2PDF 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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 17496 bytes
SHA-256: 92b322257da62319adef3a841b32b3dd6e722c9c10036072a7753e1bf50d3916
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 11280 bytes
SHA-256: c49d72d222bfef744b8b56452e345b14687be2181b5ba3f01be847f6e544b370
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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