Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a2d6c15a6540e9…

MALICIOUS

PDF

131.9 KB Created: 2021-09-07 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dfea35592bedceb98eb81391d797e8e SHA-1: 07ed0e41076dee91b9611a9057e2a20d4a3b848b SHA-256: 62a2d6c15a6540e90df9262d70d5a2816f519dcec1e03d8d070924bdde07118c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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 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 http://phuwangnam.com/user_file/file/10010540472.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8al0iaa432ej1jocsm8fgmaec3/kotetatiledilotulesaw.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210516234818.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/74998028805.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wiper.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/84879216408.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b02c8010---56308287415.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/bupetosorunuweponimesula.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ddc8999f3ab21ac8b06806ee7176586f/68645292894.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8d6vit3l79pgc29gml33m3pnfg/bunola.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1d713e72a2000139ef9de77dfb0c167c/34231337609.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609889a9cd59a---ziwugivuranikada.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/taminijafedogaxerebilopa.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9a9a6f10---libidajatuxoromolebexil.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/41847616800.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/nigoripuk.pdfIn PDF document text
    • https://esvigo.com/upload/files/feforidikigerotifetizixew.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/dd89c7b7e1130b17c7800a138b8948f0/84234494846.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098641343a56---poduvujiwixoterakatelelo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778581016bc---xawarexi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/82537253129.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16126cd1ce56ec---kosel.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r2p3vlihd3090eg86h1htam560/36927578138.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c25b7ffd---23851353451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=application+of+matrix+in+real+life+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18588 20580 bytes
SHA-256: ceadd27450fff5969852f9277b4680ebf5036b132086a44a094cbf12ff6d2b44
font_01_sfnt_off0001bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB62 16060 bytes
SHA-256: 79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe
font_02_sfnt_off0001d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D073 10696 bytes
SHA-256: 1a24556c5517fbf4f7bf7db4384e58d51fcdfab1aca325cd987b64b9b846d1b2
font_03_sfnt_off0001e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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