Malicious PDF — malware analysis report

Static analysis result for SHA-256 4206aa5ebd1ad40f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 02:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7028e09f4e332d0ac90a8a9d09ca8532 SHA-1: bb16fe1dc3370ffd66862754a0dbea565c69a5cd SHA-256: 4206aa5ebd1ad40f02ab987be4d432a7b8a4f55fcb0b94e7fe5c5ef6b33a8e86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=uniformes+para+dream+league+soccer+2019+m%C3%A9xico+liga+mx PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2a3f56a5826d6ca6209ed0a2a155af68/75005259874.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/11545462686.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/rowinopawelojekipataji.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210715170122.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/98702254453.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tu03dkemgpbs50m4kmm6oh5a70/gojanululazunavozupo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6b576838b208e30f20f225034b01b7c8/2871638266.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074b29f8dd3b---92243538723.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vuvofud.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pumazar.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/34487829533.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a65edc1ad97c5bf1624b2d53d70aa546/kavapixofumenawawonu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a146e137a7b---zopuludogilaxuzinamuzem.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/88360777105.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d222252103d---panumelebitasusedi.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/99062827717.pdfIn PDF document text
    • https://ip-pharma.net/data/files/16849093674.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/robamepemu.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/xulefizukezotaxavozabebe.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tepakuduzebe.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa91f46a21---70510436904.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091319c0bff1---tavarujojafonev.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607977278a48a---74170042222.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18c5183ce---6826279085.pdfIn PDF document text
    • 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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 11692 bytes
SHA-256: 4956cbde093029abb8af1cae9f12f422f98fe23ca2dda01e765421242feb73f6
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 18968 bytes
SHA-256: fa41a408a5940ee03d344c9b4262f7a393043c3c7de8dc1b45a1abdedac46d9f
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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