Malicious PDF — malware analysis report

Static analysis result for SHA-256 14920f16b914a360…

MALICIOUS

PDF

140.5 KB Created: 2021-07-07 21:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35f7f11bb436ff79971d793a8fdbd3c4 SHA-1: b524776db6804bea45942f563ac8a2ec984488d8 SHA-256: 14920f16b914a360c05d68e6871682bc433693de2c9792adf86093e5a27accb5
66 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The presence of multiple external URIs and the nature of the link farm suggest this file is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4400

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://accesoriosalmayor.com/images/userfiles/file/90140496640.pdf In PDF document text
    • http://nesemlak.com/test/images/uploads/files/wekexapa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e4d3f0ce---xasiwakidajexinegozowuv.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/77879252928.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d237bca1130e0ddfdad3c8c5f52525fa/3128183284.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8b49213dfa036daff37b7e82863de3f/guzojifisenegotujuvudixef.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1a04d6a---82282064147.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/62093575398.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/adcb3d0241af63c9d48e4595ceff1547/tupatijaxukazowowo.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/ligukiporafar.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da091649050---93311012100.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/notexi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ae1cb8875e3551a66d744b2331051855/jabozudodulalalamasibufi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i52kf2sk2f73fg1ulado0lf00/77214798375.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/90775089919.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jenofuxepugisexasota.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zoxitu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c2ba282a592de69528d366e0d96496ee/fevelamevurovu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c38cd466---rawovogovenisap.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9b2a413ff5eda193aca717842d502cad/66684749877.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/62098870973.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bl021qkkqtep93rbflbpehcgl6/sekanasukumatuzuxojexezad.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90730b2b75---zasoruzenogefofujijebuf.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/40370568276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ps+vr+pcPDF link annotation
    • 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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 87524 bytes
SHA-256: 10100a80a24425a01596dc32d1d6be77eccf331d8122afbc63b853af42f2d126
font_01_sfnt_off0001d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECE2 9680 bytes
SHA-256: 96cc380c6c9e91ae08348ac413aec2638fd484be8385278737208eb442c42f28
font_03_sfnt_off00020207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20207 17592 bytes
SHA-256: e9b0df019d2971269a4eaeca8cd882bf68e585c63c7e255b18b1b1c8b0a37911

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