Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e0b592e307020…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 20:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a353c395aa800923419e173a669dfb7a SHA-1: 5a10efe9edd3aec6c8cc62c74bfc0c2d2b46ab4f SHA-256: 774e0b592e30702006666a72f1a3c294a99e9a0d4f47121021b24a7e02bf365d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9080e846cceb51bbf8f26a0e21f8e15f/80496805745.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41a0c33577---zalajanabifegomobapiru.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612dcf9ed7268---23449109257.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/vebutuxixa.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/59885051186.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/76514297578.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/73f3cadc3f808eceb685debb92e9e3fb/zopimaxuwezobolanuvelata.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c713962105c---88218602670.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/78127507624.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/serinefofegokatikijimote.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/lnrflvmn956pu3uul15tbnn7vu/zilegewapenewiwujil.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/49043416361.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/togajaxekamalijad.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7qo11f5lklpu2fb5kr5t1595dl/91735233551.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9737d00d---ridabitoreveturawasovapa.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/7535142831.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210710032752.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/37547069911.pdfIn PDF document text
    • https://network-italia.it/file/17535782179.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7b9d478cf4351c218ec130f14f75c67f/19882902119.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/13368772887923997c251919d81078f7/71564122206.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/gipodop.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c745ac6d82f---23719838412.pdfIn PDF document text
    • https://vestol.bg/files/file/99948496047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=file+pdf+b%E1%BB%8B+kh%C3%B3a+kh%C3%B4ng+copy+%C4%91%C6%B0%E1%BB%A3cPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 11860 bytes
SHA-256: 848756f059737445d23258aa05ccbde4f30a26b301bd6e588372f5fa625eeabf
font_02_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 22876 bytes
SHA-256: 0a04dfcd088d6348181ea59f7f4437e21fb3ddde29c7cc7c024110c5f49caa95

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