Malicious PDF — malware analysis report

Static analysis result for SHA-256 7502da70553be0f1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 23:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c2138c6a1008ead7c9af9b176aefa57 SHA-1: 0238d6c85d72047ebeae0aea24b7395cade51832 SHA-256: 7502da70553be0f182281d52ff26cec74ec9cb0c0c22fe020b83f85460d11e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a potential distribution or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://led7.ru/file/nasezebozazijubexub.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2qfrptgpqr2gcpkhmi674nnqp3/51168907382.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/58092626110.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ate742pr81nu0celfvsoqs5lom/nadenijuruv.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/repuregotakuliga.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b56a45caef3c252fd925ac932b732686/tojudararezusisug.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/xolirutisapowixanebem.pdfIn PDF document text
    • https://petala.gr/userfiles/file/nagadivuzikukel.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d40767f4ffc43948b06295497bca732a/18262137652.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f1378d75c7d3342dbe8b8102cd8f3427/47712314392.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/96800206797.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f23a9030b---negoxakisaxol.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ebaa02a191960d75d582551821f9406b/biwevaxipogiku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4d1bad1ebed180719e595fab04fc7a60/82685797601.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/49358134419.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f8233c42a6c89c7964c0951b12dec6da/tokaseraveda.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/18645967452.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/16638835365.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a16f7405c---sitenanuze.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vipavibegubidinugeseg.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9998b3c502---22684708065.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/welefijuvovubojukidede.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/82591835973.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/42248c63d1836b216b6aa07ffd1376bb/19287418100.pdfIn PDF document text
    • https://parc-hotel.info/file/gekiwupiretoj.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/jesefoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=circuit+switching+and+packet+switching+and+message+switching+pdfPDF 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 17172 bytes
SHA-256: 40f2acbd19f0afb5b762fe5f2e268425d710d671d3b12d05d947fafd5cebebc3
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 11212 bytes
SHA-256: 56a17e52d0c3abf16a564bfe13f00914e02d6610aef9541d5d7b4ff46c7cf03a
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1