Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd94722f9361554…

MALICIOUS

PDF

92.7 KB Created: 2021-08-25 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf87a1818398540566886840f6cbaaba SHA-1: db922568e13e81037359b21b6ac9498019f32402 SHA-256: cdd94722f93615549ccacca0e7e9f681468bf71d0ec7310f86daa4ba7a743ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://garglob.ru/uplcv?utm_term=flowers+with+sad+meanings PDF link annotation
    • http://uticachemical.com/files/upload/files/31432917018.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kejulela.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a37c6b76---67447972416.pdfIn PDF document text
    • http://odumakus.com/uploads/files/17882261669.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dcc9ba74c---junure.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/jamizobojufomonalofadarew.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cda9591c---levuxikafagofenu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c3d93e3b94e91ff40d77f9611b22477/siwikoj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/225649b5b21e1feb3023f1af7dfec29d/fifaguwovumozina.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8uj2nbtoo4m16rguolkd5f4qgm/jubazulapefupitalovofus.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/05727d9d4125375e1763e9c0553eba93/vuboba.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tolexirulolul.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/xerituserunuxogon.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88122933745.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6120db6a34---24745861195.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/75025885667.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7ec7758462a5e1d63f8929f749687ebd/razesikarefugodifi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/gokibaredodifosemarogizi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/lutimovabuxin.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/lonerasigofekijiwilebe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0b8fb3e2a0e2d90c3e7d95f405d3d5af/javonepekewis.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lifalipefufagitod.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/koguvuzixilu.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/40748810585.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/newifovegalekiwolaluxi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10756 bytes
SHA-256: f3aedfc66acd9574ef139becd530febe7a81050215adbbb08a5fd94eea07859e
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16968 bytes
SHA-256: bed352d3b475d6b6b112e8255c871abf2c5868ab493e2bf0936b6abc73f264f8
font_03_sfnt_off00014a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A54 17544 bytes
SHA-256: 75436a35402d2edeb7ede50fc63566b79efaea3b86169cda9b7058f63be9d1fc

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