Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34b89b2c1591932…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 14:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92ae44314adcd7442ad0e0871f195723 SHA-1: c85d334ae02cf57e0409521acfd2075a4a3738b7 SHA-256: f34b89b2c15919322cf99e24a80172f145b34a2ea84416c01b4a0deb9047eee3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yesilkoyluleriz.biz/resimler/files/76787033699.pdf In PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/91027537145.pdfIn PDF document text
    • http://samtekelektrik.com/files/56034136922.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/nekedobixinanofakez.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sutatalewitim.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090200193098.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/fofuxax.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/dizozugefabopu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b7b1cf41---woforurezofuwesarubur.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jerululagisamalubakisaja.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/kaxopixavanidedinikiwosid.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/bifanix.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/53976284423.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6be475f6b2314723b7bf5dcbd50f70ef/26164689643.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2c856338954646d77f00b030099437dd/99330030345.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/dajesowowimoxaxewusujovaj.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/begesipagawaroloviw.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/judosajarixemabubisenoj.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/7308691257.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/79782776548.pdfIn PDF document text
    • http://domuran.pl/files/file/gimonujegakivagipor.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b9f77529---51605702444.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/kezuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cetak+dokumen+dari+hp+androidPDF 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_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 15896 bytes
SHA-256: bad5006ab4b061c0a884224730acfaccf8c812a91caaa1b8e69164cccbc97f28
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10668 bytes
SHA-256: e388b9a62c7750c65e10f14edfe3da9a142a11bc1f1131909864b43538039156