Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cce40109f5ae82…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 09:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78d4e3a60da6cb19844026d5910fd40b SHA-1: 1d7ec6fc9f4d6199f87b9ccebdae50772aa26051 SHA-256: a9cce40109f5ae824a608198db59e68ca1e237d3b24321db67646ce01c050ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://irlanc.ru/uplcv?utm_term=read+only+memory+is+a+part+of+which+memory PDF link annotation
    • http://otevrel.eu/ckfinder/userfiles/files/watofolipabab.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/35024790447.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/53605021242.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/99204404279.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/sokowolofolegunizaxufas.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/65935896715.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/9475773606.pdfIn PDF document text
    • https://dafelia.com/files/liwuzo.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/101028451393.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/kuwimasedeg.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/27572724445.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/35026185305.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/raluwukedovepigobapotas.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/77687433423.pdfIn PDF document text
    • http://104408017.linker.tw/files/sisusadumatofexub.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kolugitetapekixixo.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/2705445053.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110401257596.pdfIn PDF document text
    • https://podimercrm.com/img/files/6171041443.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/20064241019.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f80e7e198e21a803da7dcb0378546d33/lobutuk.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/zadaw.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903051155.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/64b64bd2533e0d7fbc9ae485f75168d4/pagifapogunozamutinuwu.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/wudefokujikepezozorefere.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17916 bytes
SHA-256: 9a7256f8494c175b62f09eec592c8eeefd24fd63de9339677375d10b47fb4086
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 11132 bytes
SHA-256: 4caa0565998265ff9e791246dd60d1a436142799ccad7a7f4f9c49ceb879cba6