Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3108faf33df2329…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 22:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f526f8e15b809a91dcebfb5dc0af17 SHA-1: d03391c47d3611659c18dca8216ec2d614c61c8a SHA-256: d3108faf33df23293594b8d147ebfb6d80195629f74e7b6f15bf10240900b402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://consol.hu/images/uploadedimages/file/medepakexovorewu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7322c562e5---pasazomolosewufokomoju.pdf
    • http://au-coeur-du-temps.com/userfiles/file/19750818425.pdf
    • https://abofahed.com/userfiles/file/81388712674.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210610_C8DFF3E2D4AE4A6F.pdf
    • https://85097781.com/upload/files/88042257252.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f29c973665471777b5b2a038c3dc6b00/kuxenitadezenafopekezomap.pdf
    • http://traiteur-ribot.fr/userfiles/file/xojejejoxewufefa.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210807_E818CC6FB9528E0C.pdf
    • http://halmar.info/userfiles/file/84481525181.pdf
    • http://www.peretprod.ro/content-images/file/35923615298.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210628_195325.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/4866999078.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee684f511---fazutikiz.pdf
    • http://gaziogluenerji.com/images_upload/files/zozawamokab.pdf
    • http://ottotech.center/userfiles/file/xadagisadu.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2058bf9c6b4b67c3d71b90cf0e61f451/wedegukaxes.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd9b0602---76108313852.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3ad34bf21b5bf43a635ba3771ca0ccde/4594786786.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/443eb08c6baef05bf14cec625301d867/pixewenusexolurotid.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/5939564568.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/46539135997.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8580f00f4e---18966113812.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077897f3625a---lebizil.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e228e732f0---mijafopesego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=five+languages+of+love+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
font_01_sfnt_off00010070.bin
f56fb0c6edc089025bd83544223b90a4ab60b23c8bd8d4620f70bca16b12bc28
pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 18088 bytes
font_02_sfnt_off00012f88.bin
6cded96b29359c7cab4b5c7a89c878ffedd6af3ca8dc6e2cae59cd5eaeb4f693
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 10812 bytes