Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f1130e72bf02b8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 07:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97f5a32006dcb67a2c0f0352bebd4aad SHA-1: 13208f5aef9510bfbe08b949b06ea140865b2f18 SHA-256: 36f1130e72bf02b892bf00cbe2347533387db778a3104fd647dd6104c9318d0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on compromised or disposable domains. This indicates a likely phishing or spam campaign designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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 https://cructi.ru/uplcv?utm_term=ge+spacemaker+stackable+washer+dryer+manual PDF link annotation
    • http://wajl.net/img/file/202162120196.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zaxedefemekixe.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/042e3b545ce9024e5ac415d51daecae4/22882285417.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/26/jutaduxukupifetubonik.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/16736489703.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/dogufebixaz.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/59805538595.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/zuwavodagusagimiribe.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/35800495025.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca27291036---dibazugaxoxukovefudo.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/piruxoziwazuk.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48496a745d---nujusipodubizavoriwaga.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/14054314510.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160aca448db73c---busalufa.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611549122f2cd---sewopadokelilari.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/voselebujoriminazepokob.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073654ac4b26---56681653231.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/16227283220.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/velinerivedodepeje.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/96290314553.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fotibusagaxojisorib.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832391c1eb3---28779670622.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/bibeg.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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 11140 bytes
SHA-256: 278efe637e401a8a1b4c0e262655a52c3ec68c6b0ae678299620301d05593e9e
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 17596 bytes
SHA-256: d9c76f6c78d9d8ca21bb591bed72660492885d5a97cbb77584b0d677124e30a7

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