Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c8790ec6e9f8d7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 22:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15a9dd6b1a7896ed96b9c5f8b4e8c96f SHA-1: 92a19e7b7be88aa2ad50faa10e93abc8fc43118a SHA-256: 26c8790ec6e9f8d795ffffce1dae45e98ede21223a64c4e30dfc1245938fe1fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kompaspt2.com/contents/files/59531821797.pdf In PDF document text
    • http://backkwang.com/userData/board/file/ropadimomuzosul.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/98602463043.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161358c0a14b3c---16771950996.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/92474759889.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/83467607772.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/giwirurijasigizolonezew.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/42543003201.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3831d0cbe---jiliputuborupu.pdfIn PDF document text
    • http://wdnederland.nl/file/tedexed.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c575b145e---zefujinutodamelobej.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fafotiledig.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kevixusubifiriri.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nobulufakikeg.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/60291069064.pdfIn PDF document text
    • http://sun-eko.eu/files/file/kizajajoxomimazimijon.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fumelapakudaloroninez.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/20117760953.pdfIn PDF document text
    • http://wsm.hk/images/files/30570969053.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/bodofebodedonaz.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/japitupidadamavizobepofe.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/nuxubesafedawazidavob.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/dusoveko.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/91938944869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+turn+off+headphone+symbol+on+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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 11192 bytes
SHA-256: 1dcb4a6bf1c5cbe68f2a17c9d23ff24e2813d673aa931b9172fe6359e9f8fe46
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 17596 bytes
SHA-256: 7f3ef80d897c87dd04ca6ee57c32c31dd9aa01128692ce115ba29e6afd3aab75

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