Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4f94c3a4fcbe14…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 10:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f53fd7b26cbbd6f3ca6015309c8de9f8 SHA-1: d411a16848cc07884290d79d06de7a047899fc80 SHA-256: cb4f94c3a4fcbe1426302b87b6486e215279869d01c82bb77e00b6f116500e31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to multiple domains, some of which appear to be compromised. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.zolmedis.lt/ckfinder/userfiles/files/madefiripolebezuxego.pdf In PDF document text
    • https://timminsrenovations.ca/file/wbglYqodElYvCd9V.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/1957107830.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161388a7d16367---zexebafenorazekujopawajo.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210908110619.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/jirukajuf.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/teferexapawaluv.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/61020078400.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613930133a94b---81012306351.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zesuxo.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/89341048163.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/lemudiberezudowupijawanij.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gidarojexipo.pdfIn PDF document text
    • https://pcetravel.com/files/file/taziganikuzute.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/jizuvaxogorodilove.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/padekavimujurakaz.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090809383047.pdfIn PDF document text
    • http://www.polni.si/Images/files/29680495014.pdfIn PDF document text
    • https://digireg.nz/upload/8929400173.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fufewexonokoxekifemexe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c936cd7---33757662715.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3f624c3---45533661995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+reiniciar+un+samsung+youngPDF 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_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 10672 bytes
SHA-256: 69d473a8d60b940df28e128ff5b9aa80dba6dc4ee30022740e18d46832ac4f87
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 18696 bytes
SHA-256: deb4a7c3293b0a796cf48ba221a05e5d53f081008fc88c7843740fc8212d51a1
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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