Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa3a7f4fb19b7e6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 16:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d629394644015964d25c1f14b8a89a7 SHA-1: 258f5c6c0527d4e29bbe010412e0bf0f0edfdc29 SHA-256: eaa3a7f4fb19b7e6a0a7311b3b657c00d1cd0f779958cc0e8ea48e82a12421ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely for SEO spam or to distribute further malware. The presence of external URIs and link farm heuristics indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=ratio+word+problems+6th+grade+worksheets+with+answers PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e60bc78dab68681887cf2a6608e63df6/2995373281.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e8ndebva3iimngmo5lt1ao3k35/80015585021.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0cc37d3a96768aa7ee197a44d3aa6a4/jaremagozu.pdfIn PDF document text
    • http://gapp.fr/medias/files/poneramo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b0bf7b1e7---13574896409.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/68460881630.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1gq6p4ut031tslhh2jbvs3bami/pafigilodetizow.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/45702516038.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/nazexu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0af87b32---64583316006.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9s38grnjubplrle26vqa6ag6u6/57201261390.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/tovubuviguk.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/galusatokofa.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/60572955327.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87654997553.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ktf0n22ml3o22p4dkquecu1sr2/wizorapurojigizedotog.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/75247941886.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/39784661343.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/tifiwaketodag.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880eda3e7a---guwenigu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/woxofe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39e8d2d64---xipunalisapibimoxewur.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/padirokixawumasonejokigiv.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22134593779.pdfIn PDF document text
    • http://chinazzjx.com/d/files/19541873259.pdfIn PDF document text
    • 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_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 11368 bytes
SHA-256: 940ee9e591042860781a7084f7828d9dab431009168d92fcfe4a4fa20284bdf1
font_01_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 17796 bytes
SHA-256: 288d22706880ba448e0382355cf3ae091f94a5291eaf97ecf6b3eeb4eb9d6f85

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