Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9eac8e57e8dfa3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 06:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc3fbb634433f813b9e82e00f853c601 SHA-1: ffc6b6be872c7581f765314cdb9d1414c3892c1b SHA-256: 3e9eac8e57e8dfa38e987a4fd84aa9bf9cb692a1545f63393a4c4fffd65f8d55
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The 'Urgency / deadline lure' heuristic, while low-signal on its own, supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb808b728a7---wanawakerudalanemap.pdf In PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/33437139266.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/181da34c0e0703a26bda82aa800befd5/toguvosotanajatadapofos.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/51189887670.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/76818386320.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/komijajilu.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/xapolalapuvux.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/54de0512847865596c4d3ab2220ebc8e/79563882423.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nb9cga37e7dns0kc6iskp7efj5/99806474923.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/92014504518.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dgv97n5eopcdcp79bl68cqg261/dokawiku.pdfIn PDF document text
    • https://patc.fr/imagesfile/falagimefi.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/27166884794.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/67798327802.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kewutumuwi.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/bisire.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/73876582446.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eaefd14b21b1a3f7c53a7b9a452e8e8b/64736172198.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/1099443935.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/14673236048.pdfIn PDF document text
    • http://domuran.pl/files/file/5707926687.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc565523a3---rufasuvivetipixozedupozax.pdfIn PDF document text
    • http://cocoal.com/uploads/file/boretizumofevujipedokose.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/83215489924.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/48610452293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rates+of+reaction+questions+and+answers+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10944 bytes
SHA-256: 1b95fe435cecee17f6923d30bce87df6cb60929428e069ffaa72fbf777d9336d
font_02_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 17688 bytes
SHA-256: 7047d4937370137dab1f3cc3a60a43f580db12085d3060a4299c7e3c761ad898