Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4f3cfac10fc6b2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 21:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69a15812eb9be426a8e8fdd298ff4cba SHA-1: f20306eb8fdbe27b14e3ed6f5f4b270ba2e94317 SHA-256: 5f4f3cfac10fc6b20386f2663171c23564eff3d2fec859944bab4e9e013a2b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised CMS uploads points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=can+i+use+my+phone+as+a+guitar+amp PDF link annotation
    • http://esistore.com/userfiles/file/36555278805.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/resebizedipo.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/pubeda.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/kifogofejigo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/33571410961.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16143b90cb2601---82432697355.pdfIn PDF document text
    • https://heyratacademy.ir/file/87584015285.pdfIn PDF document text
    • https://inks.bg/userfiles/file/sibaguwutexeleburulut.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/kelerefijopopasiribufo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/zefiguwiloneruf.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u7d8mebl5fpr4714jroe0ao1c7/lusifejunomubaludim.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/tekilat.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/fomusojur.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109090516277473.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/28020906688.pdfIn PDF document text
    • http://aimic.com/userfiles/file/85155963056.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416d2f2414---jalurotukemur.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zajadokosora.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • https://negaratoto.com/contents/files/kizan.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/dipizapewuxizag.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/lurud.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wigexubuluxo.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 10896 bytes
SHA-256: d3e1fbe053c9a9fc0700b7dea6e978b21bfe337351998a1c60dfac1daed8bf0c
font_02_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 18864 bytes
SHA-256: ec8ff9ca97e1ce2f57fad5978558171c7cac085a3c593593404b73cb44296ee8

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