Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c268f8159ee1b7…

MALICIOUS

PDF

85.7 KB Created: 2021-07-15 20:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84f4149247afaca27077b79b59159ad4 SHA-1: 547b891e4f4d038bac669ab45bfb56d7b309b7fd SHA-256: 65c268f8159ee1b7799b236ff1a94fbadf192113140c277816380a15e6c055fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. This suggests an attempt to distribute malicious content or phish users by leveraging a large number of seemingly unrelated websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdf6a1aea---pegujaloradudexebexoru.pdf In PDF document text
    • http://llux.vn/uploads/files/3693828759.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ifvmrf3r5dbd75v53bqpbpg169/61630237594.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0bd06e7c---76641339799.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0995049182121d56be95b45c7c0e8c6/jiseruraragubefasek.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/fb2e17eb3bcabf4d8aedcfb637a0e503/18156893602.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/aaa0751f4f16bb1f8041a69546f3d882/defikikenuverowomijor.pdfIn PDF document text
    • https://digireg.pl/upload/tatirexunalosifu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/97468320e8e188a6c9fa7a68f8f31f5e/rivawopasufuxixuwemom.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i9a6cnptbu1bpblamh8iu076o5/19474176614.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fadugajimududu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/nenotefuduwuf.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc6f8de68d6147bec8afe1bc789dcdc9/wumatonodituzin.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/10864210506.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d4866137f70354a824ab53e93b31f4df/16218179230.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ch1t700o0mgffa123u3h0g208g/80776779253.pdfIn PDF document text
    • https://ever-progress.com/upload/files/16014079224.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b055aacf---41366975361.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zomet.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a3be77553---49750552630.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe4ae62a9---rudobudepivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ielts+writing+practice+test+academic+with+answersPDF 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_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 10880 bytes
SHA-256: 93a62aefa944fa958349454f6470be562ec2c7af34848caf559cbc7860c64cd5
font_02_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 17176 bytes
SHA-256: 6245befc75dff450563ef4804c079c3cbdd93415bcf52210aaca82186f8fc381

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