Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20453d68c9c0f55…

MALICIOUS

PDF

84.1 KB Created: 2021-07-16 03:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bebcfa366f6660e119c068f1f5f6855 SHA-1: 184b5a483fd8daf3f3b0b1804c46d9513ed5d2a3 SHA-256: a20453d68c9c0f557b6a0b75fecca8b705235361c1f7f8a7a9dacabe36caca4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for phishing or further exploitation. No scripts were extracted, but the structure and URL analysis suggest a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d71239278---ragikufopumowegad.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/niduk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b108dfba3---mividupomawurimapoxusu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8g8ebe8rrk1m4aflm9qd7tm8m1/77361310520.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93805720415.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2213ee33be937906fb83f6bb9d06625b/rozopulozofigof.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/90278252931.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79edf72adc---jefiwutojimot.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1k4ktvr5u7g05nc3a15eekkpjl/32821091248.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/29745342239.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523737ccde---fapufef.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/68779027413.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdec7d865---vamewofagasemutib.pdfIn PDF document text
    • http://charontrade.hu/data/file/99706883790.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/97078224753.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e20606011---62805041385.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7vmah2pm4di2rdnb0lfnbj896o/fapirogowajoronokix.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946857578db---regibasikalopokapo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d524ce0be4---torexerekugobekuga.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dizovokejimene.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a49999d356c---kepowovamuletosafepi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed12889df2---xalusaba.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/73525954797.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4a9b52c875da1a009b40f1686746e86/dovomomeravukuxolus.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4ba8o1au6kop3agjik2fha8gf1/nidifokirevowag.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/50298914954.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2eefd3ffd146be36b2b19400e2d4a17f/88409140387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sentence+for+defamation+of+characterPDF 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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 17312 bytes
SHA-256: fb4e194a96d6d78e780edb4ba72dcc29497a8597e326e6bf85018c394cbc59a1
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 10600 bytes
SHA-256: 113c54c3ab7beeeff2d0771b32b5106a98e634ede2fe820b377659b845fe6534
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1