Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af946757d2c2485…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 08:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67b9d0998f0b04368f316f71aad0fcc7 SHA-1: b587d16946b84f3340cac7ae69e33010d84f7fda SHA-256: 4af946757d2c2485cb5d5b0b330c8f534b6d5a9301f4f65a4628c5b721b83619
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites or initiate exploits. The PDF also features a link farm with numerous external URIs, many hosted on compromised or disposable domains, indicating a likely phishing attempt to harvest credentials or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://musik-fachberatung-neumarkt.de/images/uploadedimages/file/19405668568.pdf In PDF document text
    • http://tythb.com/uploadfile/files/seputikujomegofadijaw.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/vobilugipubegegawexo.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/75058909564.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/24570234767.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369735bc27a---18211055843.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/78afpv7s5i8251mco75vcb087h/dunazarupako.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/42407505783.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/nakevaxipakojetedalom.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/firim.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/balusamokefiwinubavobuza.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/93433733678.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/87816506610.pdfIn PDF document text
    • https://agros.net/uploads/file/59026469357.pdfIn PDF document text
    • https://laps.pl/userfiles/file/30941413410.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/figuwiwirasidukosil.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/voraradinutokifonuwupuvas.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/88755709673.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/mijepemafixupavusakag.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156e2053b8eb---5903174007.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/17341517242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=permit+test+answers+californiaPDF 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 17184 bytes
SHA-256: 2db2e084e8fab345ec5020edbb189368b5aaf135541b4982967b58abacbd8433
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10584 bytes
SHA-256: cc02df877edee879e17e2d30c875efb8abb51bf889413f5f5dc649f171b43db3

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