Malicious PDF — malware analysis report

Static analysis result for SHA-256 7975999c5078af51…

MALICIOUS

PDF

128.0 KB Created: 2021-06-18 23:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: de8d0479d04afdda8c7b0100756d5e07 SHA-1: 5e0e75bb6775fa14cd1ef7b0fea7b969967ed873 SHA-256: 7975999c5078af5134edab262c21f560a267db91813e4bea3c845e3d4c8d0bde
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098473a7ca3d---69379869044.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/sko4aer2mubqg6nbfv9lc837t4/luxosulojajijolasus.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7bd06beb686b47036a94313f7197e2c2/57392522438.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ab3f8ae60ad2daed8bbe821f4f75e1f7/15713364567.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf01a7b9f---jusisoxa.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/8256578573.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feca23562d---84226702236.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/72260789041.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a56a11491---farujalizanetip.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070469b067be---ramekalubumiranumixozoret.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b441b656cd66664aa4fb31de417d0134/zebibitavezewapafaxanu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3006316517bc05c4fd21d4e72f060766/novixadapulavuk.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0ac33c32c106c679e001c95ebeea5d0c/risobunokofizorezivadazam.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792688b9984---sisosexi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0d5ddae99---nomusurazezixuletekosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=movierulz+telugu+bheeshmaPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16163 3584 bytes
SHA-256: c4fd0805d3b73042f585653c4b201bceac8dad78d6a71f5f14e3ae641cc769aa
font_01_sfnt_off00016e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E16 5356 bytes
SHA-256: c0d9a67ae066f3e3c108ca177073288c0a04454aa5f425cfa8663fa0bf35c968
font_02_sfnt_off00018037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18037 4416 bytes
SHA-256: c04260bcefccc080b152060b52822a47d1e5fc894bb36ccb7c5b59eb648a9f25
font_03_sfnt_off00018e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E74 12800 bytes
SHA-256: 558871c214afb099ec9009da55a0918f1770858e6816327cd6623fdb7aa8a42c
font_04_sfnt_off0001b99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B99F 16132 bytes
SHA-256: a96d251c53480c73c9728ba64b5e70b9d3223308b758237b57710a9ba49b32de
font_05_sfnt_off0001ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED1 10804 bytes
SHA-256: 576bb89e3382c438f57c7efa134c2703ebdeabfca5731470a91a94f413a3388e