Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb37d9d52c08516c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 12:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dcc7bd843b11dc7d54eeec43f75d1c5 SHA-1: d95192f5f576e288f2cb2fa937f5b3cb025b4890 SHA-256: fb37d9d52c08516c94fefc989a1e7c511fc4366d4de81619fda19d7ab7e5c718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=oms+nanijdham+login PDF link annotation
    • http://bayernglobal.de/userVZ/file/85355408397.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kitozegujidaz.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/ropuxus.pdfIn PDF document text
    • https://phukienbep.net/media/files/turetefudar.pdfIn PDF document text
    • http://atek-ent.com/upload/file/7197589000.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/89361031225.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090815193073499.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/tuwakafo.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/7157799524.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/tizuxezukofugo.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/zojowepinofupetivove.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifjv320cuv1iklfci3mh0a46b4/98639110288.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/5a2sdr4h5sm330od1vdnc8tsn4/gufitirepow.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210901065013.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/dexabowiwuzunijimu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/nilakilakosopezoba.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/60267879535.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e3a2dfc9d---xukudevulepiligabusasape.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339e56e7d4d---55310428741.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/25917479889.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37257b437---60521962410.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f5f81e80---80692233486.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/38658640449.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 18332 bytes
SHA-256: 17c6932629652bfcf3f550e21657c02fe8425ea59b2d930e29c09d09cadea66f
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10520 bytes
SHA-256: f9726a511f61e8713c99c0a79caf021c498dfa20a4059aa581539e0600d7c14d

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