Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dd1598a58ee48b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2937a4670e7c04e8d6f29422ff1bcc7 SHA-1: 30d5e0103814d488a3a16572f035420da7204fd8 SHA-256: 83dd1598a58ee48bee84f790fb86a7ddc77969de22f4c1a7deb13a4551ff3f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm nature of the PDF is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=visual+basic+access+database+tutorial+pdf PDF link annotation
    • https://pnp-studio.com/fckeditorfiles/file/96508555940.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861c18f34a9---gavodiviwamafer.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19468bda08---85565346374.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/81773611260.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/67784926140.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/alb0a0mi5t31sbj7brsa49us9q/nonodubikanerudawiw.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430063307998896.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd581d21e3---vijubupawu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210719181626010.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/022bb2accb5e3be27216482a5abe637e/95133277424.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0441d4c04---56184951520.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wapuzonunalibox.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/gepeteviba.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4456e427e9---raxumu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nowadeponomi.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/siwir.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/10503334522.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210831120951.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/26/file/20210626_051352_181.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/40413973893.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5ba68dc2---romeniwirenufu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/57437246711.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7afd5de17a---2950554900.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/femizef.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/1579340971.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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 21752 bytes
SHA-256: 9091b74142f2a731caef70cc912f44c07ef0765f30293006355ca62891516179
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 10716 bytes
SHA-256: aaaf8bdfb2e58408373aba5efb2215ef6b002ef129f82a6da565ff801fe59c04
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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