Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08bc2b00191f6af…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: febd890f014be5a39189bfd54bc19f03 SHA-1: 19842bdc240e33a0de2dadf1e11d46f2cda768cd SHA-256: c08bc2b00191f6af083da2d6c98c7047579cdae4fcfb467b923a1f2ca49d257f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mimpiindah2.com/contents//files/gesezovupifexunudivigixoz.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161255d8aa9dd3---fibuf.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610893776cb88---26242733941.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092594d0e8d1---vavulova.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/03f1d501eefd64c6d0bd6751778a2e61/19383773306.pdfIn PDF document text
    • https://seerupit.dk/assens/file/82605986874.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b403ca5639a---81927487982.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wasuk.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/794118003.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/guruxe.pdfIn PDF document text
    • https://adium.ru/userfiles/file/7183001979.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc4d36721c---zinalamarukef.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/11751740924.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160768438e82a4---99930304018.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/54422e21729e473a2d632e888a523ca1/53165853135.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bf9ec199f7b2e821f9d87e6c1bacc0b4/xatanenewapoximad.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e78f4381214---sibobitumoxoxutopizijilod.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/1409825597.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-11/20210811134351570342.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/puzanixipo.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/43889636400.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/66708652307.pdfIn PDF document text
    • https://peterdegendt.be/file/gigamegekuzop.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qmte50k1qps4dk7jhhec774t6c/95544924631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=automatic+control+engineering+book+pdfPDF 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_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 18536 bytes
SHA-256: 669694d4bf277c6a0bac6084ba676059be694f1fa87ff8f3fda3411e5aa577da
font_01_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 11108 bytes
SHA-256: 4e0f02ae0599660363874066e43f81ae9e32fda738c0361247c7e64f62c5ecfe
font_02_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1