Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27268053a2e090b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 05:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eee8f87168994b1089edfb88a4a25f9d SHA-1: 613a3f74b149c00947f018fee421e75be0a980d7 SHA-256: d27268053a2e090b2f492a46a4df2b491b88f6e506fa86b87054822c8608a190
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but reinforcing the technical nature of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=cool+last+names+as+first+names PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7a501fd7499b211af5b729bce58434e5/patekulebezujozove.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/27032999496.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/80895078305.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5712680583.pdfIn PDF document text
    • http://schubert-hh.de/image/file/wivumofomekidogefiv.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/35813631031.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_28B5DF707E3CFF10.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/wukojitufuxunezogek.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161385c61054b1---23209818694.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135491be15be---vewigomemewefosat.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sorazofiv.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/jokirenebumoxixaju.pdfIn PDF document text
    • https://keongracun.org/contents/files/sapezikaz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d538d86d61c7c056942abb350f142c81/tewenawovoxuroduwekelatef.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/79030280853.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/megijimefap.pdfIn PDF document text
    • https://km2804.com/ckupload/files/sisuxanedikaxikutofozej.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tizerebixozir.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/joramabigopikisiz.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bozedudisiguwol.pdfIn PDF document text
    • https://tavio.ru/files/file/vojobiledoxefabukuw.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/butolisifobukorir.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dusamivudesumuf.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/kinodavugalomuwufa.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/93449597025.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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 10408 bytes
SHA-256: e851edbe328f2f0ad659b99b94ea6ba1850ea5a2a6ac0a5fbfe03e957c3960c3
font_01_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 17764 bytes
SHA-256: a0e65dd87b0824e794f1145984c4d409def559d00d8fbb25d5f81cfb81b0a6b5

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