Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c217e10699578df…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 22:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f208926e8d162622287a6a295c25c6a4 SHA-1: c00b78c82a224af0656aea82984e82503ebcc523 SHA-256: 5c217e10699578dff92acb5dd6aad05b409773709c8f6107365f0ea5fa431371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be directing users to external malicious content, likely for phishing or malware distribution, rather than containing an embedded exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=i+lost+my+contacts+on+my+android PDF link annotation
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dca33e7fa70d129c190709c1f404b022/94558778586.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/xomaka.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/pawimosulugulevagu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/498d44f9d22884f7592a87c4b759e1dc/60895133470.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/18099587516.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/44841942323.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/magobujasefupapogadip.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/59755957006.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae95decbb5---30525409594.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/rudikuginegasilabe.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sezubofoxus.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/49535077830.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97655296408.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/jisivenik.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/51144986612.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/15806090133.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/55723259505.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EFB657029A404061.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/binotoloxesi.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 10464 bytes
SHA-256: 03ba27f1d0ef5a0906249d77a76429a7611e946047e8714d57031869d8e2b868
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 17668 bytes
SHA-256: eb94d6a7e705798381b7e0c10b5202fcb6121f25401330d163a8005d00431139
font_02_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1