Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d991e912e5fa04…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 14:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 91a839878792c5b6273aaf8bfac9b292 SHA-1: d1c756eddcedd728e74ec24c3a57d033db789a91 SHA-256: 79d991e912e5fa04b0704c66141d70478d3ac38d674abab174c71c0d5201f46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of embedded URLs and the nature of the extracted links strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=famous+people+from+alabama PDF link annotation
    • http://naturallabs.de/userfiles/file/78358499897.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/eaf15b3d2c1afd6aa884f4850bead7b5/15644733812.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/juvosekidu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015cf6f6d3---94019225856.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ab3b9ba5---75032275915.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ec25724a7cb1ba7595f0588f9ef5dd20/jagekelosupovamoxuk.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf64046f3---sadaga.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/63481832417.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/lisotijofizukoze.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5649e5ef1a---teredoviseganogopifig.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97b67f18f---wonorupiza.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e56100909bd---pupimoxag.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/56082218568.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/boxodigadivasutisafum.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b85a0b7d97e---kidikaketukogefabi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c10606d456a---83339599836.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/l7d5slelcmsgo99htb7bho61fj/72336208094.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4vrqjs1jqjr9rdu4sotvfcr8s0/wamiremevosujivaxuzak.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7d86680b3d4e92c2746e1ba80de82160/63306321955.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/32557930795.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/omosb4tv1tga4tqlrfacdcdop8/58331282096.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8839b45b50---womonefikobubogawala.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c0f9d861d---86801139654.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7154a830c297998980ee33f5031c9c8b/5762412271.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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 16580 bytes
SHA-256: 50bfa4e16ceaadef5430f36b5a019f0bb649c8f4a8c4a142be25d262a814264e
font_01_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 10444 bytes
SHA-256: 75f2988f66aac4b6cf410b8d17673f7410fede6dddbd05a976cfe6b101f6a3fc
font_02_sfnt_off000133a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.