Malicious PDF — malware analysis report

Static analysis result for SHA-256 7734b839de6bae6b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 05:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73e42eff47e29dee59c27a0b2920d3c8 SHA-1: f8c3d1ba10bfcae2132ee18c8dc2573d927e9c4a SHA-256: 7734b839de6bae6b4ca970785e8624c409b39f3cd1031f4cb552b5a384bd4a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL destinations point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=politica+monetaria+banxico+pdf PDF link annotation
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/87033556509.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cf36235d86---94381762340.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9ca8e508---majopavitejovoraduxosok.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/nijuwegagake.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3948f3aa3---pozuvugudabumojog.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/87479864219.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/r3vmapr5eioiefgup2vt9mqobi/pixokuta.pdfIn PDF document text
    • http://raczcsalad.hu/files/70766222477.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874c3084716---81879407026.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d0665c0c---18498964032.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/58085285400.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1da78fd19---wililewas.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5aca8691---97653565371.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3c19078b---dutuxevis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb89a2979f---sivefelesuwemolivekikiban.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e73c8000---11965972773.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108302011247996.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25d83ca1bf9306dff51681ac29f14821/63522386759.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vanorojujotukobomopekozim.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/laroduwa.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/l2in5lk6fgm6fq216oajohjn97/68100100511.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/58466120574.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/97250487741.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ab9b3b0---mezepebabidebude.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085202116e4b---papababifiwajumur.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/biraxuretozax.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 18296 bytes
SHA-256: 356393f861e0d69f31190ad703b80884667c1dfc1cb6f7b9eb4cf077393f7fe2
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 10856 bytes
SHA-256: a09086939d8a3bc0c3036b0e10c0154a3b9f3ecaea01dcec1d67ac07d125089d

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