Malicious PDF — malware analysis report

Static analysis result for SHA-256 098300a4a496de6d…

MALICIOUS

PDF

123.3 KB Created: 2021-08-08 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44f5d6e945b4a6919b2098d643469055 SHA-1: 1d7e1733223c03811c49d53ece87cbab5fdc7f20 SHA-256: 098300a4a496de6dabed86dec033a16233b881a5a998276ceffa166f12e8aa27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abf08470b---vufusigoledapiwibekisixiv.pdf In PDF document text
    • http://shinies.ru/img/lib/file/ranajuzovuta.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/58829535595.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e974660e4---wazunuvepefibakawozu.pdfIn PDF document text
    • http://www.polni.si/Images/files/mosidibez.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/95627109170.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d655f49255---xirukegevexigizatesebudol.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/pujetenodonawavapile.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/37822632142.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9a4d5d30---86997751712.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kuwenasasifaja.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/11344243981.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20154dc84---62517946214.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/7191136951.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/befesugisunad.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072d35a1e131---futidigu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/12800406239.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b50b8c1ba---wuwufolepiwevif.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/vojavaluxukaxavarerev.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210805_141134.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1de72bc7e8---90995574066.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625f9e31cc---valolakadijer.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8bp90n13v2ea6904uh2ivu6daq/pikitivukolusufuwi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c07b408c205c414215c952724b65628b/tisubinukadisa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/17q7o5q39oev9h87u677grdfb6/xowigepasoz.pdfIn PDF document text
    • https://activepymes.com/pub/file/xeziwegixatulikomimi.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/67352621513.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce887f42d---nuzitisadatijati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sample+monthly+financial+performance+report+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C7 18660 bytes
SHA-256: 2b0b240990873e7fa2187eb80a4733b898b3739656081a6395c92366c7ea3699
font_01_sfnt_off0001a2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B1 10868 bytes
SHA-256: 363f137e03c5b72953badd341da83c80e42079a09b4c84938842741a3e4b9928
font_02_sfnt_off0001bb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3A8 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad

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