Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dced7c586006f9…

MALICIOUS

PDF

176.3 KB Created: 2021-06-25 15:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 386ff0d2fa81273da55d6577f7c3abc6 SHA-1: 607c17dcdb7c62a0e9eec0792f20fbdd2a6438ae SHA-256: 83dced7c586006f92494e46df82d3c0443d94a7c29ae04d979f519a4e5adca3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic findings strongly suggest the document's purpose is to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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 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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e235f6e6bb---37609028111.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/0ni0sjt82sikk449ovu4v8m970/nofuludenavujokenale.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/62333989204.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/komaruxifidatemamem.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/fojiberuwajirigibimid.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/roi0p6qaq6lk2k9hulmvvn6dvv/daroruniredigezuzevuwek.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/477d426b03655b6a4e275698d9fe52c0/20999411430.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c899d8f375f---7845137332.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ccf051d6---wujubokitizufawi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/96039898654.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/kusoxazulavumoriwagikom.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1e2a1c61---17468922283.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/58093063337.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060413052380554.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wusesizi.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/23987349971.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e8650d8f0ed54173e3136ea0f62bcfbd/60749818370.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ebfa6e29c21b1d031ad375f3bb8fbca2/rafasikibeditoroguloked.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b69686d3aa7c0a9d213a74f102b4238a/felijibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=biography+of+moses+in+the+bible+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_off00021a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23291 18484 bytes
SHA-256: 37e3f6ce9c9efbf73b39d2ef68cf518adc57df1e33176b6d41676f6aae5f345a
font_02_sfnt_off000250d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250D6 11252 bytes
SHA-256: 746a3e05d411814a6187b83f4982e40b8c67a390172f212d65d4921b68d17db5
font_03_sfnt_off00026aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AA5 31836 bytes
SHA-256: d29424783c104454f0e20dc746b6949809616f0ca676d3fdb1a953942352023c

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