Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7e1c7af45ba692…

MALICIOUS

PDF

97.6 KB Created: 2021-08-21 02:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68b77c0c9955f2aa5a730af6a1b800df SHA-1: f7dd431f668e5253be1c00b7af33066c5335fd4a SHA-256: ca7e1c7af45ba692e3441466ad772be07e9b034fff8a7b6e64fd8ab31beeabbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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 delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=how+do+i+set+up+my+centurylink+email PDF link annotation
    • https://aromamarketing.md/img/files/42776038191.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/fikitibemilubolapokowa.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc8578462---jogaxegolosokovodu.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/tofiroralu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/muxidapenu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/60336599113.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/bevop.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vidasoziluvawusilodo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b440acc8---nozajifisusup.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d345181ad---97152661593.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/31a0ff87e9b9e5071b6eab25d6ee4e11/79165103912.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f0ec2a762126a22c04c69c63e0b4dab4/81803473803.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2cf4eae09f1c0eb973d15e2b0b05c65b/gikabojekasu.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/votetafosuwubaxijexawe.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/70514449718.pdfIn PDF document text
    • https://mmtours.si/uploads/gafamewe.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/nikukafabedawovumurutofiz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9896cbe52---kamevemajexigujesolu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bff809740798ec88f8cdf9231fde94e7/rupaxabonejaxudu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210815143002.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/logazetesezamimapelovekus.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/77634878090.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xukagotapigi.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/37265386805.pdfIn PDF document text
    • https://medtek.vn/storage/file/fenivekajujetigepinixuzox.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_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 17280 bytes
SHA-256: 95a21d8c3148cc9bf21d343141b5d62ed072f2de4befce3588bfd70b12401d91
font_02_sfnt_off00015be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE7 11060 bytes
SHA-256: 3fc17afb4b91b1a0593ea421c0522dd2cb9d75f0cd905d3b03931baafd73b2e0