Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aea3a7da21ff46…

MALICIOUS

PDF

132.1 KB Created: 2021-06-26 09:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8469a922360c3376a5a3794163a7bbbf SHA-1: c7c13bd793e73116fd9632952f52f80ef29c688d SHA-256: 76aea3a7da21ff46ca6e7f0b5ddf58b88879d57e93c09fef67a5ae6d78f55669
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous external URIs and the nature of the links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=select+rows+in+dataframe+python PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b21e0726---xutigarupidexime.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/18676717603.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/13700448078.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ef044a29---55396638517.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bevitefawutejubotuzoxag.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/0c63002c71c3aa270404958fcaf8b2dd/toxemijek.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/tf31oktafournp880qvr3hs790/rinuxalasubukikavimap.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/45428514f7207198001c26c8efd6206c/20692640523.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449014c03---nedojenolemudiwix.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e260eca7b2f41badb0e0842f802a6249/matuwuratozubiwid.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9448344306dc2ff14964a5ac2a411a30/26354311676.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lnak3754eufibbfac26h1udoqm/84959806164.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/69541080370.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e441e0d1---bekiku.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kudabegoluderevuwazusutad.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/51407204034.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c5fdad56---36522466767.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c401101f9---79054715126.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210621002321.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf30aaf42---regodominarorujiporop.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/77218068453.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/66c6abc427e4b9c11840e02dc3a3fae2/39736843427.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/85507239082.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb4f73d9c---duxaparakizuxebebu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0daafjrdml3i5dl6tfcd8kvsuj/20447395289.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_off0001a10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B925 11160 bytes
SHA-256: b915092d161665536e29f56c60e5c414cfd7233cb3f3e4d8dd13e8fae029fcd9
font_02_sfnt_off0001d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D30C 17992 bytes
SHA-256: 97d62a89913acb40a293abc4a6b2a16bd94be7e560320f59eb190c82045a04e1