Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a5ada0bd30251f…

MALICIOUS

PDF

75.3 KB Created: 2021-07-26 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b53a5a2a1f97638d7c61329a51adf2ca SHA-1: e0dd60718eb79f4eca4708f40f779ac7339e2159 SHA-256: a4a5ada0bd30251f79f32346e8fd33806b90da401b4066288f3875d85a270425
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/05067342540311124325e4a12cdd01c4/notaxada.pdf In PDF document text
    • http://macabrey-luthier.fr/data/Files/39303064442.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c9a595f---32994061413.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/birugaxipelazekaberule.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a750ed6dae70b40470e1f6207cd94765/bakesolizamutojazipimudax.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/efc8ob2svfonha1go5cmh29js2/35444334249.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/51376276506.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d17273703ed39ea6cbce8dad547534d0/xojenuledimedis.pdfIn PDF document text
    • http://www.puhito.hu/uploads/29805784318.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607583b046f0a---64885407732.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8c4c213ce8e451e3870501685b0a2a4/buteboxe.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/lopixujirajem.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lafulosuzuwapivenu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/pebemazanu.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/67240446319.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/faporad.pdfIn PDF document text
    • http://dentherapia.hu/files/file/52577568256.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/xexenuzuxojorujedibi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vemijiporipadogor.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/tujawamojidetapona.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/20805600361.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608606fca32dd---dawipexaditutut.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6i88nb7ei442r1j7mtdvlt342c/33513489173.pdfIn PDF document text
    • http://rld-carbon.ru/file/67622170735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=student+exploration+solar+system+explorer+gizmo+answer+key+course+heroPDF 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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 16248 bytes
SHA-256: 21ebb665dec597f926ee25265c847d8ce5a858a20377e393824d3748601f36b6
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 11592 bytes
SHA-256: 1458271e4a99fb1fa79370e5d6dd31b470540954e553eac4000d169ce5bd6f85
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1