Malicious PDF — malware analysis report

Static analysis result for SHA-256 08db910e9b51ea83…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 12:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 852540749f55c0dc2c2693d75e575024 SHA-1: 8dc6bf1064bf0dd7605df2c4008305016003ccb1 SHA-256: 08db910e9b51ea831b9129c6a46f9cd782a397f1d91a18d728a65f0d07732105
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware distribution sites. The PDF structure and embedded URLs suggest a spearphishing attachment attack vector, aiming to redirect users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=neurofibromatosis+types+pdf PDF link annotation
    • http://rickgrisolia.com/userfiles/files/41413586285.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/2760481881.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a980b8838---nujikokofemosobadapoxov.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48349160216.pdfIn PDF document text
    • https://tekmaker.com/upload/files/70350797211.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/32udpujbuknnc85p0bo4uo0fj5/48642574963.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/11699854545.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/69899534078.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kogasafekovadonusi.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/57558419152.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vilotukarasomuguwulesu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jazovuwupugewuz.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a6c1eedc8c9467ec6fc0a74a283079d1/defoxibi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/62504931238.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemaratenefajawazamegoser.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cacdaf2a---39515894092.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc76c35cab---74407565806.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d1ee74d851916fc857b7fa9457651f07/lakixize.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vbckgnp9p3jjqat4fd98ungk2d/81370540215.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/13332308676.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/74595843153.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ara6mipsfv2aiqg3rmdm3k9f84/duwemubi.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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 16036 bytes
SHA-256: 401514afb8d1fede057c801569e9ae8b7b981024e79692e9eb417ec48cdabd6b
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10840 bytes
SHA-256: 2d2913f1fe829a5b86a3254cf537f85f93ee93e26d03fd93fcedba817242ab52

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