Malicious PDF — malware analysis report

Static analysis result for SHA-256 294523050d299567…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 00:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dab397ef9814d7cb414bf25cd4092d7 SHA-1: 5c62dff5d6afc1b08af9b2a25828b14785d4e8dc SHA-256: 294523050d2995673d5af9afde0b27f33cad0bb61cb1d1c4ae39adf1a6df49e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and heuristic firings suggest it's designed to lure users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://movietek.vn/hinh-anh/files/limubapowaxaramoralep.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/nosunabejora.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/37429550737.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xuluzesowo.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/22972341004.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/nisudosisakefurifiriro.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3461804---mubekadokanarodixupesefa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sm8thbs1c0mbcerogf954ja6v0/20933278371.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5677893493---35342370461.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1576e4aa5---kapifesifuzuzunakakiv.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b40e8ae87---3542871345.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967a66a293d---lebonimarote.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/32201810933.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/27638516667.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/dudamawusekezutepa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c419ae65d6981da11139d4d2969c4d14/sularobokafigopo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5a0a76b1c89a9d164e5c2c6f049aedf8/tifevojefakurovaxedisi.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nutumaboxagevuriti.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf17cdce22---81308023397.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/zapixerevap.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tizis.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/53998251667.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/52388866495.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/paxilazenemutozureb.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/97224802927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=crystallography+and+crystal+chemistryPDF 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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 17672 bytes
SHA-256: a2dd801a53ed9bbec780ccdae9ceebbac544f3c568c114650da0db65653ac855
font_01_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 11104 bytes
SHA-256: a69f6d41b2afe6400fe4757afe993fc12c38965c54ca193cc1a367b5542a7199
font_02_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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