Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85fa217b8724f5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d718ff873494a0f19ffa9d9149f80198 SHA-1: d6ebbdc4d249057e396222c5146a73decbfe7d41 SHA-256: 1e85fa217b8724f50fcb82b62d199afa169d6b303707e65e7be35f4d224381a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://goldenpeak.it/userfiles/files/51949639245.pdf In PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/tubaxo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5ea30722---20751420496.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/zetumiwusokibamu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/062f971410fecc9dee812a6b4ce7b8b7/fizinagofo.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/60806022276.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/27160698562.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/roxutixujijiganemafaleso.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/38ejg3oludve29p4ggjer99o85/joxurasovojupuzejoju.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/todonetu.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/38210837282.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fba4b936c93f51289b33a8cbda29bfdc/26157675231.pdfIn PDF document text
    • http://candientuvibra.com/images/file/nidewob.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/38443260063.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/mofajumupanilerutok.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/pewukazadaxifezuku.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/41278559230.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3d48de4a---15233855038.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb961f1823b---nitotanajunajobogafa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d031be295---65900148854.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2ce31e6f---botiboruparo.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/97230726705.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fdb61ba328d76b1f9b4135a24e3f0003/nixotoridebunisidotuwuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jaap+sahib+paath+in+punjabi+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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 18440 bytes
SHA-256: 719e2db8c7eba19a593394203d2b44fdc7d93c0cfb440531f3f3f749f9d7f84a
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10556 bytes
SHA-256: 75566032dea9435d3d4f1ad69913ca935d5bd99ef412ee391e2779582e0518de
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1