Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22177c67c52d852…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9586ea6b4b56f6df7307676ffc774546 SHA-1: f32603c508a07562db9f652917df6d2046b83983 SHA-256: d22177c67c52d85213b77b113bbcca3008e47a012bda05d22397880cc55c06d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://unovosti.tv/ckfinder/userfiles/files/47698684916.pdf In PDF document text
    • https://narellesastro.com/userfiles/files/38590241478.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/7710867335.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pononosafedilaxavunobak.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c07e92956---4148842881.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/guwolabana.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/buxopajuzamavuwuzijudo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mofape.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/felazeliratuzatukekoxek.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc864c6428---bubajijol.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cc9be11d---sijij.pdfIn PDF document text
    • https://doitoutdoorz.com/file/FrDWnAMUqhrf3VqL.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/76056465231.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210906_173122.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/27755033193.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/76776971790.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/13221749851.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/jirotirimoxuzelevabuxoran.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/85190919834.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/fepemidubexujasibowiva.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/71771200596.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/93577295552.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10ef5d98d1e7bab4b8811a0425a4e063/kumubirujegevokudan.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0fe6822913480dfb6fb661f1ee31f31d/13463602829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sapiens+gujarati+pdfPDF 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_off0000afe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE3 14764 bytes
SHA-256: c825969a2fbfa10e8e9992b6ed086544bc7e032838556842ccac3855c84ccba3
font_01_sfnt_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 10812 bytes
SHA-256: 16790dcdfde5d5c84cd760deac5a8ff0316e740753510ca274bb508b53c92b8d