Malicious PDF — malware analysis report

Static analysis result for SHA-256 347bd2cbb8732239…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 23:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cdf74baac6c4d4d9f797974b54e78c84 SHA-1: b208d1d2383d48cb861a287e00fbe5cf79c9f775 SHA-256: 347bd2cbb8732239319913bfa945595c53d8cc0670dd77403294fc35ae8fe4f3
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=australian+bushfires+2019+news+article PDF link annotation
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vunikonokufutesidirun.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/zepisutodubo.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/80485925509.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qp0os6c5csc4voc3k6hlno3741/48590726975.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9f167168d7505bcd82ab9e973abbc7f1/97803607584.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zibaketesut.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c78140993d3---godobusasi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607056c7356ee---luzexosemujusenazizuw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/900p7dvk38rgt91k0ig43dgm85/bajavegigu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tusajukor.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d291c1875a00873c89e3d61849b7c08/47797377501.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d173cb8853---41166899090.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/96095990494.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/db71a661d9e6e064b651472e19732dbf/kokakojonogalegodural.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210804_2F11E0C9588AAAFF.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f8bc2a6f---pekobizuzufat.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kazajodetewet.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/ratilitoxomuralewa.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/8136623157.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/60446928683.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/iqjra26imcc502s0jihjimhhan/sukiwupuxojuwidapepud.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/58507434797.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/74480683495.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1In 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_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 17644 bytes
SHA-256: bbd2413bdecae01d6b038b8f06b54af6e1184cdf0b24c927c6395d0827c61b5d
font_02_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 11080 bytes
SHA-256: 52946a66ff4535109602eb916d313f5c17b10011e747a618ecea69431e15c94d

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