Malicious PDF — malware analysis report

Static analysis result for SHA-256 5583b13685a83d49…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 18:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c37cb037ac689a20ff8e6cb199d67e02 SHA-1: 5b177c3b5422d7e10c52895d03cb010e1488d1cc SHA-256: 5583b13685a83d49adc7c8c09299c85f1ecc2cb962f90fc346979cf521f62a93
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or IP addresses, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The presence of external URIs and link farms suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1247

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://archism.ru/uplcv?utm_term=minuet+bach+pdf PDF link annotation
    • http://nigerseedindia.com/uploads/78632555511.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/kovugukezosafadajetojin.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138a87f5004a---rasizebuj.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/63269778593.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/sovedikewosanorivisu.pdfIn PDF document text
    • http://usagimatur.com/files/others/2483427184.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/gopobes.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/48266818772.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nojowexinowenixujotote.pdfPDF link annotation
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kivonavekuzikiruwirino.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/vetefonimibel.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/10121254946.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kurasozawiza.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/nefoxatibumurogof.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/59368687107.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071912475934.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • http://vodnik48.ru/content/file/61344485228.pdfIn PDF document text
    • http://jinyezi.cn/upload/83292944480.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/vubakizavakefufiwu.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/86617539481.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1b96fcb7052150cdfd428ca252ca533/fobaxufetomumimetifon.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/fpquf0lga80hdrfljglfbpp9rm/33109175210.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fobag.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/80528309350.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lo6pah9gki3a7k8iie23budjnt/31930278962.pdfIn 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 20160 bytes
SHA-256: 80a63cea53b4db6ccc0ad444311c0ffc51191052db22113cb4e9b3f938cd59b3
font_01_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E8 10516 bytes
SHA-256: ca84f832b93579bc821eae2ac5b4b293c4ddab02b81572f67ee76882dfce87dc