Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7717d265990a38c…

MALICIOUS

PDF

77.5 KB Created: 2021-08-30 16:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24836b31444304fa47eb66ea19c262df SHA-1: 46886276101035a2cc718cf5d5a3f51eba4dd246 SHA-256: f7717d265990a38cedeb218f0041e105cfcc47141067894c7517bff47f530a99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/74a4d87322b302dbafa753555df2f079/75798810658.pdf In PDF document text
    • http://hollywoodterrace.org/clients/863344/File/78510789674.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b2fe229a2d9da39b112383447392fe57/80063448637.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/93376021474.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9toq9kl2k3hk5dju2356avvkc6/51833030828.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/be827f42b083f8a40fab1db91ba6be73/ligazetozeramukizola.pdfIn PDF document text
    • https://aspirans.com/files/file/84247278676.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vim7h8mgri3i4bbu9dk7akrmt3/rijami.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c458b5baf01d49d83aaa78a89e27f5fa/tefotokod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd15cfedf---78214543324.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caba31d955---9066228000.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b24d2730989a2932f15a4229c370f277/kevema.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/62de2122022bc79b40d98085b7877e11/24638123043.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084987e8123c---wekepigapo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba4dcb57---35295387190.pdfIn PDF document text
    • https://tomas-music.com/contents//files/70659576832.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/mujumodezomupig.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/tumijomapiworazu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0rp7ur7pp9um620o3tue3g966/lexod.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/4666187611.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210718210834.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/81051452600.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lasuwavokasetujim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=top+websites+to+download+mp3+songsPDF 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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 10996 bytes
SHA-256: dfdf8456daa96e78340fb0398cd228400de0851b9227763daa80875ce9bc44e4
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16736 bytes
SHA-256: 477bd69c5464dd96c64ec73a3eb9a9e1590f1eef315add358b7c4bcd89f60e98

Open this report in the interactive analyzer, or submit your own file for analysis.