Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8ba49eeed3e105…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 03:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54d73c985d646c1ddcb750a51a2a3f1c SHA-1: cb86f547bc412079b66ea195f7170a05ece11776 SHA-256: 1f8ba49eeed3e1050eb17f17a22cb1db4ee768f3d591160f7a34b56282dd1fd5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking malicious links. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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://drafthe.ru/uplcv?utm_term=how+to+factory+reset+phone+without+losing+data PDF link annotation
    • http://xindeshiye.com/uploadfile/file///2021090222155582.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/30079538370.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/xajokevebiniz.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614137d4615bc---piferesedumixi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/dipodofunujav.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f71764c14bfac389efbda24ed2dce183/15644613597.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/14609877181.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e537893b7---jamikafizikazizapixeda.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/kaxomokikov.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9312eb8b---31867048797.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091017514373499.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/28046026787.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/daxowo.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/73240812049.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/tojitudofakumevuxi.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/37365283265.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0ok64cebgrd91gr6uk5f6estl6/fibejoburiwetiboma.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/logugawasetem.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304bd93ba75---48658580281.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/37216355843.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b9ea511b0f3791e2f82efef743c4619d/17801520401.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/77878270450.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/62975060497.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_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 17016 bytes
SHA-256: 17f244459f8350966fbc3e39dfd0648b219d8e5fec196a67f008b0679e46a919
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11188 bytes
SHA-256: 37bbce318401006ed3b31771c50895d1e6275ef67f40ac99a3ce511de18ab062
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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