Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4ee019cba7c481…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 23:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcf647e87fb082f391c83444321911ba SHA-1: 8e70ef54ba93d01b85592fdc056d271d02756bbb SHA-256: dd4ee019cba7c4818e080845892d59e2b40dc2d75e236ccbc49470994c89593c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=vola+sports+live PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613383d8e873b---nejigozuranuruzuju.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/nazemeliligabunumopo.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zomumawimetivujes.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/82942729397.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/penivolobageviriwosa.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/mirorerenesazerogafix.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/33538347044.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6621b5341912754e89021259996bc9ae/borapalap.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/15030009191.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/gibawerugeteralu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/70569454091.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/lavibuvesodofaxaf.pdfIn PDF document text
    • http://neteyes.eu/editor_up/91407137216.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/89186605720.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/biwijenaru.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/73283315723.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/vipipomujisefubagudegunep.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109151454029532.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/vujutafobagopixoreriliw.pdfIn PDF document text
    • http://haai.org/upload/file/dedepo.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sugetamikimupusuba.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ebebb2a1---sureg.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hajrgt1iikc3o6vq3haimr2pvi/kagafi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/103703196616a1221640cefe21bbab38/96324502139.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/zoxebotavarojerepifaxezul.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/mipapale.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 18524 bytes
SHA-256: d7d71951b51a2b03002e1a4efe5ed83902998cebb3e354cf686428617d30aa87
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 10176 bytes
SHA-256: c200c4e4e50d52f2492445f44536e1d1e2321455b90a95878f13e9c8a98f9e3c

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