Malicious PDF — malware analysis report

Static analysis result for SHA-256 97af5d524c4bf1e9…

MALICIOUS

PDF

138.9 KB Created: 2021-07-03 00:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 677ae84228d6813038aeacd2542e9b81 SHA-1: 54709265a2715c9a201702d31476d5bcda3c4c0d SHA-256: 97af5d524c4bf1e979439edcadcfbaf4aea62c9ad691d041a355c6d53c149149
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://medvor.ru/uplcv?utm_term=don+quijote+1605 PDF link annotation
    • https://alatheir.com/atheirwsfiles/file/8858722881.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc9d55bd0---ginatababefop.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/16000002901.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a24225ac---9193801162.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b45611df9d0---85623102869.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4eb6edeaa---pivivuzukajilujuvifokas.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/donajaba.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43f3e627b---xubanepeme.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf4ddc619---vimevanonujadazewipuma.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/84611669869.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/81226063759.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6ed9965---51153035215.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9460aa5d1---wonutovaxokuwazev.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/97ltmlojc2dcr8a0dj55vq4uvj/66478268927.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c307fdb121c---moziluwukuluxetomu.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/77602038460.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/govepeliwifoviwanife.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608325360c6cc---zepokuwizolove.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/npv4as732au33f4soj3lnd04bn/88281233371.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e31e3383---83323858058.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kezamejarewojiwakutiwu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c50f8304a3a---seweburaxopoburutogekarox.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/70995845239.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bvt2kvd245552t3lgo8retk9s9/razubunedow.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa51d8700---99272310916.pdfIn PDF document text
    • https://telenovella-bg.com/files/jubepes.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/58022efc2cb88d2a1bf24179a96c2551/panukeni.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_off0001beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEFF 18720 bytes
SHA-256: c934f2bf80d608d0212c46c3ecf40be6fbe66ac44caca878bdaf65116ff94f5e
font_01_sfnt_off0001ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2063B 10476 bytes
SHA-256: c6fdf740baa9855588f4dc17c0ba7f168a568bd6155958d7a2af1b47b8cd889d