Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7d2d70f314d722…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 08:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba3204dba7be7ca2ae8ffec92ad94896 SHA-1: f7c9dd639ddc7a16d9a65b4792bd67322872e4d5 SHA-256: cb7d2d70f314d722a029a91ce174c2fb95953e61c0a220fbbff0a8c68516e0d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier gave a high confidence score. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The presence of a 'download button' heuristic further suggests a malicious workflow aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=pirate+proxy+list+2020 PDF link annotation
    • http://melabo.com/upload/files/xopasozapejugux.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/bonusate.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/5502935901.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/punibubawusuf.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zogevutasetatomexirenope.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e84e4d8c0---bozividin.pdfIn PDF document text
    • https://ratosatu.com/contents/files/sonejoruwekotidu.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/sopuvumuz.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xekan.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/50652075372.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/jijaridabowipuvubizewuru.pdfIn PDF document text
    • http://isvpro.com/custom/files/34607450379.pdfIn PDF document text
    • http://bluebossa.pl/files/file/35682358609.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7843a35ad---75710522256.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613394bb54cdd---jepob.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/47792305187.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/luvoguguwerozarit.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fusenudunegologesokeveve.pdfIn PDF document text
    • http://espwireless.net/uploads/file/durokeg.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea70ee2cdf---pejopudavizivoramaxokufu.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwotirabinedefaga.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/domedumo.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306832932Sw6.pdfIn PDF document text
    • https://conrays.ru/f/data/49153962823.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17268 bytes
SHA-256: 216907ddacbb62c25103154c8429293e7f43813959ff4e8eea86e756be9005c1
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10600 bytes
SHA-256: a17fc7f91c14bb408a59fe04c960e38fb5867ee0dc0f2c4dafb2143a62d0542b
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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