Malicious PDF — malware analysis report

Static analysis result for SHA-256 d597614054db5db2…

MALICIOUS

PDF

98.3 KB Created: 2021-07-17 07:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4291fefe1f530aeca5b1571f18309c75 SHA-1: cb64674a3a6d91fb29110427bc09a056404aca27 SHA-256: d597614054db5db28377ed9452998e436d2ce1c28deafb88b61837ff352493b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other potentially malicious sites. The presence of numerous embedded URLs, many pointing to suspicious domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160967640c010e---lulolijifaxibasiwo.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/morek.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc686d8b1d7---wowaza.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/29854489538.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/sawatawumerijenipa.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/gonovuwafumudowoteni.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/53327060980.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/jajamupafanagizefovop.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/90389438039.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i9k8r3p20ncgleh8be2do08lj9/xuseve.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/25139246143.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/niwamakudifaziki.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210613035745_n9abcs.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089724ad265d---56122038509.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d74a4bee0c16b9fe13af6c1b528b8467/41961114867.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddabe70a6---58511618129.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/rmrsjiek8i5fnb6fmfkh5pke94/lamofojawu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607988853019b---rutegozutifuzadalikimez.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s3ja6pck4q5jv1k755mv4kevg/10217534050.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zaxubedotani.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0579ee45---57228780905.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e5ea2ac6baedec2a3c0a8c0b159ab40e/ginaxezoxi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2353c50ba2---83753999234.pdfIn PDF document text
    • http://edelstahl-berlin.de/media/file/dapam.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5254d6d8b4---vobanebanezatexufipupada.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a953c19eef0---jawubogifijumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=loml+meaning+in+chatPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 10368 bytes
SHA-256: d08040afd18be571b6b4da9cd4df68f6810448c81b033f617dc56409020d26e7
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 1728 bytes
SHA-256: 3e54697433f258519e59b5d4193970bd3702f67e639bb31f2dfcde737eb7fc9e
font_04_sfnt_off00014a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 17992 bytes
SHA-256: 879d5294d456bc83167f369240e39041b41605e28ac2a752cbfb870af3e556e4