Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b97a1c9d52f9ca…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 19:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88feacdb7f84fcaaf259c3bf77a212e6 SHA-1: 358471be95be431c2aea717db30dcc4106668e04 SHA-256: 61b97a1c9d52f9ca89aca60f6c1caa76eee39512316455c38ce6ff30a6eb7d7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01001f15f---solefefonuv.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b829a290615---97811334942.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d6b954858e2547d76f498ba3cee9d5a1/minaxemobola.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/21555389056.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/kagekobolujuval.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608154ea42f80---27010808160.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/34693503427.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zaledaxuwanunilagene.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tupluqhnfq3j9epope2985780s/nefuletorawow.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/67160121676.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/vaxiganag.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c219a525---17346606686.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a7f1e1a9---gaziwofivesotitifewovixe.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/2131238711.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/da7ab7c92325bfad211122fd5a3c7d7a/37822627641.pdfIn PDF document text
    • http://lawngo.net/fckfiles/zawojevale.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/29620340479.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/rutilixogebo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/duwexel.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff0d2afc25---44003911610.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc60785a3---64832990462.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/ab8c27efd12ffe5eed34a0d6cb645e1f/55619861886.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/laviruvukul.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/24098647060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=perspective+of+modern+physics+pdf+downloadPDF link annotation
    • 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 11152 bytes
SHA-256: 82aba213da3c62ec4e644a309f49949c0e8a255a24d752e0e8de21f9244041e9
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 18044 bytes
SHA-256: d8479b2f894db560699dd63c80a2488ee55daec1bb099609a424465e4f7ff076

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