Malicious PDF — malware analysis report

Static analysis result for SHA-256 878cc8b9782b27d1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 11:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1bb286ff2f96147705740c02b81a69f SHA-1: 8e8d27059a2ab3fd571bd1ed66e1d232660bb3c7 SHA-256: 878cc8b9782b27d13d06ccac06455df35b3f594c844bb4b688dc3f04a1f52e60
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a compromised CMS upload link further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://krisoc.ru/uplcv?utm_term=sonic+jump+pro+free+download PDF link annotation
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/livijiw.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/gokope.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/73061574431.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///legititupexexebisuwevemik.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e3b9a904---72433258717.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a2c8187f7675f9fdf58c9eb7a6280857/gomesajizevab.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/dokanapatavipabe.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/waburojuvapozanivozoj.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/rifijevutidovukego.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/75928373093.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zorozovor.pdfIn PDF document text
    • https://matricula.arendic.cl/files/628803530.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/42112835924.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/32702016973.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b7145024cdc67b46c53f0a65e337e451/36905931724.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/33970768299.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/49897806617.pdfIn PDF document text
    • https://guijek.com/userfiles/file/zidumozetodogugatovu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/73208950992.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/begoz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb8270f7---58679160243.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/19592232740.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16130ee68728a6---dozokeguran.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad735f4ea---41225081963.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/wuzebizu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/zujivovurilo.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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16292 bytes
SHA-256: e75f076a8d5d4e1c4baf4d68e67fa636fe5525d2694c3359a7bc7cef5e6d7633
font_02_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10908 bytes
SHA-256: 6281ebc4af58820fb206986c9a37e897b07f180990a9b587c84f9c1f69effed0

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