Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bef453b3a9f415…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 20:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd43c6e9c1e6931de2ff5315d5764f79 SHA-1: dc6e983efdc2f9d64c351359c080d8c0cf4b21ba SHA-256: c0bef453b3a9f4159424d03685624325721dabe65fe38176eb0cfafb14caa16a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=dieta+para+colitis+ulcerosa+pdf PDF link annotation
    • http://porpora.biz/imagenes/imagenes_contenidos///65690037942.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/16400685415.pdfIn PDF document text
    • https://telenovella-bg.com/files/63772495956.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5188cee320---ledagifewujugiloxixojaze.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cafee66bb6e555e44c3155d66e50826a/19961554683.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6eb1429270abbd9094a810e8165d7487/lipav.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/fagavisomavodobijelub.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/8795717399.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b0f945967d1142f2c92e653daf43d417/dagaxedakiwad.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087b06c6f908---35653068737.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/lukiwipokefim.pdfIn PDF document text
    • http://methese.com/upload/files/taxesogirukeraz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160861eb5603a7---zapivabademuxuwowerit.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0c440e9e---70980628458.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/95283923241.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cd1b0cb123bd9046bdbd1868ab8323c1/lezobofulusamowes.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/22033160203.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/antlilnfau530f01j4642fu0j7/tonuwafukavefoweburumevat.pdfIn PDF document text
    • http://fedime.org/imagenes/sabuxid.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/venivo.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/99502288919.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096251babea6---85056063030.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a630cf2d---84822921095.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/95072182481.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wexebaf.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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 17556 bytes
SHA-256: 8f630916f69ec2a772702d9017ad6372412d4c782c793b12b73c4993d1af5c75
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 10612 bytes
SHA-256: 98b9eebae9589f32874e50d35dd5c59306146d7fbaa28b63287db1575047902c
font_02_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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