Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fd3248aba850fb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 13:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4bc1cf11574b4e26c737db2d011864b SHA-1: 744c13472b65fd8c99fa76d64af1b6f143cf8260 SHA-256: 55fd3248aba850fb009d54af47afddc8bc78e239383e3344d3b9cbcf45afca72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9htuoh1akrqd6sukaku6pufm/pisoxuzogu.pdf In PDF document text
    • http://teplospectr.ru/images/files/54571150016.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tekezunone.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/39488868278.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/72609203241.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/764f99a0b97d35077c225281bed86b2b/kipomeroxeku.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/99887871897.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/72695915618.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/medijebiba.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/hdcheafl68qo961vk3i05402e9/bojufizusisojovol.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/9792597407.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/92nqpa7h4og8vlsct9map5roq0/mikajizixoxuwugob.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/55197756732.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfjoqoq66fvp3ehffcbcgaarn7/rofiwik.pdfIn PDF document text
    • https://eternalbliss.net/file/vixibubifiwapesujika.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210718150216927068.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/gazusuxilen.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908babd79a3---butajobatadarowijuna.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/59876171584.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/25651710019.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41447c30e---mupozawukosirogib.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/wavul.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zotapoguje.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d566de3af95---winovafal.pdfIn PDF document text
    • http://bdn10.cz/files/file/sixajuleneba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=solvencia+financiera+libro+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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 19160 bytes
SHA-256: 1cfe6ae8043ab5056abd2942941c1d1ea6e03b620ecbe87761517950059b3400
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 10628 bytes
SHA-256: b2fcbf5fd332fa2b2e20ca86ba539e35e2e18d81ff39be93b8dae684315ef689

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