Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e12c35afebaeb23…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 00:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cc6c9c2c67a3618e0d021f9dde9af83 SHA-1: fb0ca789419fc4f0b0901202dff6d2cc0cd54574 SHA-256: 1e12c35afebaeb23df97abb4771a9e24c09069bf15c3bcc467bf82a56f68e433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

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 https://infrive.ru/uplcv?utm_term=captain+america+civil+war+tamil+dubbed+full+movie+download PDF link annotation
    • https://jamisonfurnace.ca/userfiles/files/47005834518.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/11407101921.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gujazoxira.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914003257_1654125996.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/70617354382.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/kawilisepowonaz.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/vulufirowubekekeveral.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/rumasiri.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1705173d9---93519513475.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fe90f8b66306df95b75e91507405502/jatejumekizaxujukobego.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/51725165502.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2ba5ee11---tibijowupuv.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/85741215987.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/31894402044.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lovumirogoromo.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wadikesil.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e6487072aa053c741e60dc14e9e17feb/89182448102.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/78744680733.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/44902619119.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/11853429476.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/1780884162.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/vabitemedibokonunupu.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210914_762D36AB76CC77C0.pdfIn PDF document text
    • http://zae.me/datafiles/file/vosar.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/46637150824.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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 11036 bytes
SHA-256: 509b7584feefb1aaef28772ffb11a38eb56accb629983a57b4332e387b343b32
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 17964 bytes
SHA-256: 01d667fec1da43beb1db6a3306895d7e080919d0d11884099da08a2662bd24ec

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