Malicious PDF — malware analysis report

Static analysis result for SHA-256 588f2e507a77491a…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 19:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9c05a606ac80fa3d7eb7604b40894de SHA-1: 97e01c2d8e8b6fae325391c3f5c575335f47e8e6 SHA-256: 588f2e507a77491ae60e72da66f400a4b26eec1b6e03bae2b6fa9ff24f5b1781
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=adjectives+that+start+with+the+letter+n PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/pagodoz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22bcc1c787---39814222818.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xepinoduloboparal.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/doseke.pdfIn PDF document text
    • https://daismene.it/file/beneweminamaru.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/nugovoregirokuxuse.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/86ca4492fde3fa02bf130e48dc816c97/15404410329.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/92843435003.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f1630f439707d047a6f3dc6466881bc3/30019297763.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/09f4129ca28de7265c55ee61ab66592b/53152152990.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/51938627781.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/29950247107.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8361c64d---40443941959.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/77100447410.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/54092608538.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/106beb7d23c65a1cc1df0b1879560ce9/45261771781.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/j0svagqtmtvir55g5rj6ovi882/6095219091.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba3a3e7ee---zagepojalawexobizaxeju.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lotozevilasozanibimuxuze.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/h56j1bd6e0jlrt81g7cmcec51r/bazitudevuxejixo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe2224f3b---banatoxevitetizixisudom.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo57v4tg7c6taqpn2o9l8786d5/bopapunepeva.pdfIn PDF document text
    • http://alkanboya.com/files/file///waxuv.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e3552ddc---numuzobadidoduxid.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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 10608 bytes
SHA-256: bf6809d194a0323838b84ce9281168354717c56e2375f071d1822931fb4ed7f9
font_02_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 16828 bytes
SHA-256: d4ef28de3f1bc67ba4f87af35753cf23c7597333e3960f482aa4bd1c50c17326

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