Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f9346cb9f492d2…

MALICIOUS

PDF

99.4 KB Created: 2021-07-04 23:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4135be47a6e8529699f23703b987a1cd SHA-1: d4a015f62752caf3d0459e9cfb687885782049ae SHA-256: 74f9346cb9f492d2cf7e7cf24c2a386b287dfe7324e8afd2201237921cc9997f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.heksan.com.pl/file/jidowepojoruz.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf06746ff9---xutapokukalut.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/66877559473.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b1d5a22f---momubukazizibokip.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/22345039396.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5662760d0e---26659801813.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/494c51c61937dc06473d3cce9c344ccc/11087768478.pdfIn PDF document text
    • http://goldmustang.ru/files/files/61374077599.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/42b1299a592b4fb9a2da4ba1e201c481/73342912683.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda3213192---kerizurukuzox.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/13323958351.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a86599bf---lovuditiji.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/90803201655.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6afc69b99---kemenememados.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/15607227993.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/tiguvukirokakejub.pdfIn PDF document text
    • http://bienbao.org/uploads/files/8322666582.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c5d7ca4c74ff79862802305ebe2f5bfc/joputumupareb.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6327b8c579d2c3872fdb07500ad64479/47711127372.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/081836d040711a0168706e42a061c50a/3100721643.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60362310042.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68752830513.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rvu8s3vbafpbtumep45m9lkmcp/wimiguxutukew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=write+your+own+eulogy+examplesPDF 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_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 10988 bytes
SHA-256: 59da8bc7fa0143f0647e262cc45cc5e8145e3726021abc4a7385fb72d7dc1044
font_02_sfnt_off000150f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F3 18000 bytes
SHA-256: a820078eea7f5a706bca3e2f5c5b24bb91730a3f9e6be17f03847e1fae547153

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