Malicious PDF — malware analysis report

Static analysis result for SHA-256 14766ef911a83c17…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 03:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35e9796ebd13c5e14101b5df31df1202 SHA-1: 43ea24101747f341d81e67d6134f3dd191c03a3b SHA-256: 14766ef911a83c17ffb29dda4175b0f1143c606523ddf865afd8df5c8a90a880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wowodid.pdf In PDF document text
    • http://mcap.cz/images/uploadedimages/file/resuwavonorixa.pdfIn PDF document text
    • https://wittnebel.dk/file/venodusaxadepejowepovet.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/fipejobexinemugepibotom.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/24966822558.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/84059222523.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/df7m8ljj5fic7cirmr3h61hul6/21193623286.pdfIn PDF document text
    • http://belv.ru/userfiles/file/durav.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131833658c34---puxonatipowelumanabek.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/78722763826.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc301b72cc---84659688221.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/vepuxekapowifutu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/53424326293.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/14516249044.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wutodilikuvojekami.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/99831433213.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75391562011.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/73989736356.pdfIn PDF document text
    • http://hflchw.com/upload/file/xololimedopubaga.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/79723634624.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pelagakuvakakepedikizirin.pdfIn PDF document text
    • http://iscelenie.info/files/file/jiwizur.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1223596240613029ac9b4c5.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/bewenado.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/mabuputavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=t+mobile+vpn+androidPDF 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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 18272 bytes
SHA-256: c6cfcb6325d2f57d08db96933e1184fdd598edb7a4771afa2848755822ef54b7
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10456 bytes
SHA-256: b0bbd0c4a15533710c3ed8bf81388079d9afb1760f94b684d84d4872c1bce9b0

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