Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1098b902ed1e83…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c77fe731987f43574dbe238a0961550 SHA-1: b0d5716587b08bd3b3f88e3091d98d8befda1392 SHA-256: 2a1098b902ed1e835d61be757ea7b352a9ca73e5a58c2a15f9c5264a3549431c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The 'SE_FAKE_CAPTCHA' heuristic indicates the document presents a fake verification prompt to deceive the user. ClamAV also detected this file as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=minty+mint+pickaxe+code PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4236e1694---guzovobozevisijom.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021082819002373499.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d642200fa188f7c30c01af9b6def8b8d/migojivilufijigodanaweduf.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5af3a5ff---jezeve.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/74934582902.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf751a41f0605c978278988cee2bf096/75339553034.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/dinoladi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdd4c9c1e---ranerirawesulebigotizaf.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/89965539483.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/083746b303848a2658165025b144a253/jalibom.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/98552293129.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/refadajokebulomoj.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/27032092956.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160727c4c7c360---88287537591.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/53734511677.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nisafakojubupawowuvi.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/mamizunudiwo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c69b8881288---zajodagubofibizivenokine.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc571e7c171---bedemosigisa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fecdf055---jidekos.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bd6d89b6210ead67a1377cb477b18309/3240285194.pdfIn PDF document text
    • http://usagimatur.com/files/others/39453616097.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fcd3bbaa5---takokakivomufumibomisufom.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17892 bytes
SHA-256: 50ee18581485bc440660c2de868e39d61bb1506b3380dd125f19a72f380c41b6
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 10664 bytes
SHA-256: 7d2cac163e4ff4091454ac86c6e5e64c19f1d58f65eadea2cb4ebb6b33d4a2a1

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