Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e817b555126980…

MALICIOUS

PDF

86.7 KB Created: 2021-08-06 21:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e5202218ee2262867057ded072727a8 SHA-1: 2d8ce7655fd1a5c1e48f01a78431f7495c75e0ba SHA-256: 22e817b55512698070182c0cede4d8c5c550cae62b7645479b462b5051e202b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=terraria+1.4+apk+download+paid PDF link annotation
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/82925941479.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2d3af5f8---rurarepareribovavetapeko.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e881f0f4881e8e7a52de766842d408c6/ribedivofavenetikeg.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/ribusoxisepuvabetepoj.pdfIn PDF document text
    • http://wamer.org/userfiles/file/rilulodusozito.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/99695114964.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607656fea46ff---nujavak.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5d45035f7d80056499126285f3578512/naxujiboxiwesujemifuva.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042bccb852a---selefigapuxapowokuxuwojo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238735b1a3---3186163159.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084db6e71419---45255088569.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/19042364531.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/377e74e308ac9cbb53c2b8e3e99cc32f/37689824372.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/nuxeridojejomivu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xululamiboxok.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/80294827077.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/71640304837.pdfIn PDF document text
    • https://ultralloy.net/upload/files/funedojaruxujegitogiz.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/muvemadejogox.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/51902234015.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0559ab4a3---dupekelijugizirilobajogex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c494b1253d---20347816053.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/97106457843.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa139f461f0---tarizamid.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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16812 bytes
SHA-256: 49459a160518467cc4391b45adb6df80b74720d5f0554a94b33b57018775cac9
font_01_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 10456 bytes
SHA-256: fd0b0141110622f831b21bee6f54a5c4205aa27083305dda9dbe35b916c0789e
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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