Malicious PDF — malware analysis report

Static analysis result for SHA-256 5713e58080c78456…

MALICIOUS

PDF

84.9 KB Created: 2021-08-04 19:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ffa06d77b9aa8b6cce48f774ac05677 SHA-1: 5e5e2572131425b523ead3e7367d0dafe833743a SHA-256: 5713e58080c78456e1e4bb460ecd7874aca7d07ea81aec86582b4cd93eefdc20
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated a high probability of maliciousness. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://likeevent.it/writable/public/userfiles/file/gafazogozedisevadakopi.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92f9a5b07---55161209404.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19d2c0e2b---jopivenixonuzuw.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df429c51f---4841357737.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vs3gu0d633ltmanct7cfefgep0/52121093428.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/penoge.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/buzagi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/s5ng84i2o5fi5535fbgn741pns/97703271106.pdfIn PDF document text
    • http://juha.be/_files/file/1619659435.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/57193109143.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210629051823.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0aae5fcc7f469b50ed58241032af3806/31429810311.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/wiwipiwupunivugada.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f7f7r9fn35v63t7f89pgfsqv58/76564708729.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160928d11c2890---1342615396.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f2b80a4d7169c8874e48ec762b97a8f5/64820548538.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/73673886807.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/ridisajaxupewususuw.pdfIn PDF document text
    • http://fabtur.ru/upload/files/49407669295.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/ritiniwujimed.pdfIn PDF document text
    • http://change4best.ru/upload/file/91423515040.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/61272667411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mi+diario+de+yoga+xuan+lan+precioPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/fapidirexiturodirora.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10732 bytes
SHA-256: 37020f969e4fa81c84b31bc84d4cc4ed25adff74f9354a9e287da335a3a044af
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 18960 bytes
SHA-256: d6996b5b59a752408ef466e07e6810693957488547ee393393957f9022a07ebd
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1