Malicious PDF — malware analysis report

Static analysis result for SHA-256 d518bdaebc8e6848…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 10:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4aa60a3c160d49a9d04bf06d2a9e9594 SHA-1: f9fd1b4917bdd85f4673514e0ca6f12de8b9b070 SHA-256: d518bdaebc8e6848484f7cb3013dcda0b9d98237dbded838d0ee8e52dbf33227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16133d52f6c88e---wogaxafi.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ffd4b13c---65485756133.pdfIn PDF document text
    • https://shibbirs.com/media/files/54604767631.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/vimapaxubogavuvawesu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/55260670702.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/78916245015.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/zativik.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/fe74dd768b1f8a9739bf8accd3e251ad/vupasogezu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/14247921425.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1abe5974---29884384126.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/13264644197.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/32264301954.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f9ef94f---18732880246.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1572acfd03---tezavinisaxa.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goroladez.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/46051095256.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/vidip.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/6816124377.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/sakipugema.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/fozurejovasagetudegov.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/wuxugu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0306b34538---jobofusozozijerevoba.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085485972e29---87829248063.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1a4e71595---bamowakozunozawila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pdf+reader+free+download+for+windows+xp+filehippoPDF 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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16004 bytes
SHA-256: 89f42deea1cbd362dd12f7189e61c107fd604e2b3454874400bc7b6d46917413
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10684 bytes
SHA-256: 2657bbc9a3c8495968bced23bc19c1b0f9d8f9558102b31772331a9801fef7f3
font_02_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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