Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efa2c30cd7b8fc3…

MALICIOUS

PDF

91.2 KB Created: 2021-09-06 20:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 489e7c177a2440c6dc79fd7c5da82f7b SHA-1: ee92aca48ee2958f68a99b34f8111d24d052b830 SHA-256: 1efa2c30cd7b8fc38895c6e1b8e73e39c3605393002ec6339c8a2c124b89eee5
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many hosted on WordPress sites with known upload vulnerabilities, strongly suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lifecare4all.com/upload/files/furogeviwu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oicue5m5ooqcb4gb2k79gecc54/vaduv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c113734daf7---xibeverovemakese.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/xupawufumazabosaji.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/26042621789.pdfIn PDF document text
    • http://teresachild.com/upload/files/nodisiresesinazu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078203e54bd1---50948631674.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083857783ac1---nabumigopinikegapuzib.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/h6repbt7mdr0gb8jm2earam4eo/kubesij.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986ddc45b4---92325580951.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/zoduretimidepijo.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/fbab954e8940f5f856dc561221191143/jiwaxorolipakinizopu.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/vositemaf.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/dc6ofupsaqm478r4k7vkq06ch7/revazotuwumowaturu.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/17973516661.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3bbf66f2b83c691e4e5b348d78522233/nekaxivijezakewipafuso.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/rufefagitetefipoz.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/28237329170.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/vibokida.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/nirotexuwitos.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/78131461462.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/43327372465.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6207079e36---nakewubage.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/31buih8dlg9jmul81sg511i1mb/wobufozujerofibotanofulan.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/boxetesesas.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/27298946960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ruski+hrt+milorad+pavic+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_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 22572 bytes
SHA-256: 7e19be38cff5d1e8353190b270096d97d7e32e2bb2ce7074559060be2a32b6ee
font_02_sfnt_off000145b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B4 10952 bytes
SHA-256: ee280d01d8ddd3381cb5f1685f15405a1f87a8cf7a1538210c114dbb445acd8a