Malicious PDF — malware analysis report

Static analysis result for SHA-256 3860bfc2d6994df4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 09:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1779300dc9a27594f777b838a98fa4ea SHA-1: 5edbeb3f281e2774aed661a677eea44c3ba3c419 SHA-256: 3860bfc2d6994df40baf80d66eb50ccb62a340976d90598bcfa2453d0374f77a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=red+dead+redemption+2+apk PDF link annotation
    • http://samurairamenbar.com/uploads/files/94182215776.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/karadenesaluzaresigaxego.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c8edca5af34ae166b19f1305fc68a73d/warelexodexewulag.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/ledesomen.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xiwelutimibuj.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xuzuxurojeti.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zovefewemimo.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/motopujuximisebi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jomoso.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682c4de493---zezogokisolapi.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/17225478154.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68739546207.pdfIn PDF document text
    • http://thongthien.vn/upload/files/6049439390.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a89bf241c8b496a8f92fbf46007cedf/fejetevabajozamozox.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a127aa9e8a3e4d38f79ec98595e3a26b/23957520453.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/vomofepezesosepu.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/naxibijakugetolikabute.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/pemebokuvudoxuda.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jubelogorepovowodumov.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/22473091211.pdfIn PDF document text
    • http://mosjob.ru/images/file/55323465846.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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 18168 bytes
SHA-256: ee4e5997ecb0d79eda57d2ee7c91f7d83727fd1fb688d634ed45b6e7302572c3
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 10596 bytes
SHA-256: 52836e8973caef3b7e78ccdb4bdf3f417a963636b15ce7ac5563114a5ffdd41a