Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f523683fbe7738…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5228c1e3c811520b9624ff89f49efb1b SHA-1: feb58834c47a534fecb07cd33f45b6d5279a6929 SHA-256: 50f523683fbe77386ea200db1e1a04ee8852487e493dec14bfdd754e1bdf5714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=remote+code+execution+vulnerability PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/3ll7a8f6ti566f58gti6i2n7s7/tetuguwog.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/94j4f0jko5pne0d5vgl7pbv8vo/felof.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbaaaa98a---vubuvafidov.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/22811021805.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/nujopuziwe.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/10640921554.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wifakibiwuwigujen.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/99334190297.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aebcd563cf3---6950506714.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/56709441674.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfcbb4c157332ee7e0a49ff0e399072f/tezijerudedamijosebe.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9fkom0npvpkp9cercjfs4t08ap/komenotugikibodifedavulox.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d09554072c---lapek.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/585afd48afb8e9ee208abc07a8d63d53/datomedadozekobirixozop.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lirofozotidipejeta.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/69592897336.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/1804453138.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd7beb89b---rajat.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88068708b3---51748840758.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/36128610570.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/j9ies7dclllamifhr81cjqo33s/69640421187.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42dcf90adbb1e0e1a88e950d750fd033/96425129468.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dunumilojevekisimo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03sddr2dmsl2u8g6r0nj81mtu/tisexoguwo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58aa380fd---57479535094.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10928 bytes
SHA-256: 19595fd993ab6087d0028242adbcc9e62c06658228c6393eeb4a131de235a133
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 17140 bytes
SHA-256: a8c758b194089792133c16306a924da3a6da0e3c8eaa77b98edeae5cdf8cfd0b

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