Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa66f73465f11981…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 08:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d2ca7dcd242907c68347df644035945 SHA-1: 25a1251522be7dbc48c3fb357b8b602ee428b22c SHA-256: fa66f73465f119819d263f9fd150417dbcbb1acf2b65c761526643bb1867b4e1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external content, which could be malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://west-holding.com/userfiles/file/56539628908.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab2184980---wisage.pdfIn PDF document text
    • https://fivetc.net/uploads/files/85081361930.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/xigosigikarivapi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/1i64austcvb854dl3e55jn22l7/bogajagobepuzopivune.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wejebovezuwojexasubosak.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/44067408278.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/91027270975.pdfIn PDF document text
    • https://majubesar.net/contents/files/12872916680.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/pobisinexig.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/tuted.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/luzamaja.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/99039356662.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613120600be9e---bafid.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/bodenegigipawux.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375ac9a8001---zaxinevezoduzok.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/72805479590.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/37709309189.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/80416031564.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/96885853822.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/51768052836.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/52078477029.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/nolavaxul.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210921122932010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=highway+rider+motorcycle+racer+mod+apkPDF 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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 10972 bytes
SHA-256: 7e39f353229d0fdc9303f98df3c2ab2a4336ffb47b7430a08577a89f213c0850
font_02_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 17468 bytes
SHA-256: f32fec0d7ef67dddb3b235e861e3e8d8d2a1eb3824bca118f5c1ac7453369685

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