Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f2736294301a90…

MALICIOUS

PDF

87.2 KB Created: 2021-07-30 06:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 884705ec01b1e91e154ff2b887bec1f0 SHA-1: d85fb6b457c2589eaf24988723f4e0bd2820798d SHA-256: 58f2736294301a905634b09cff336e0c72d2c724608c54013394d4872d25ad97
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, which host further PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://brothers-music.com/ckfinder/userfiles/files/somujubewebu.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/mjtct83q2a0aut44phutjutsk5/vebisavokebi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/mofafewivafawalis.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bvuhjb975vaj9gqa5b909qssq5/4037837492.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e690925c4---gomos.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/89307563990.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/34096359065.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16dc5f15c64bc6c2105dcc406e84256c/9184539391.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/77533768756.pdfIn PDF document text
    • http://ceroki.com/image/files/komufozizuri.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd69995b73---16794477653.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zugajazawelanufada.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/53200896569.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb87b4b32a---59015832626.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/tebuwupatu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/96717538350.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/6770a6d7432997eee05d19431842b0ed/79956337599.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pegamedigami.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e21e30b5b---tawemuruj.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p546j7mv0u51fdu3uc0f13hj01/mofil.pdfIn PDF document text
    • http://bscartridge.com/pic/bujupak.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/samapoxuxukovelazilivez.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/jigifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=introduction+to+human+anatomy+and+physiology+study+guide+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_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 16328 bytes
SHA-256: d5e9fe542e5d27ee7a23f0242691008e660f8a28557f2fd9112b96c5c4419a3d
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 11212 bytes
SHA-256: 1049ad01a3fecc42285cc190efd15ef421e57d8302cd12bcb3c0f9d10f89cebd

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