Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fdab70f9b3d1ec…

MALICIOUS

PDF

89.6 KB Created: 2021-08-07 20:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6893bdd784123a13d389d93e4f0b819c SHA-1: 0ee81f0f209fba94509f5d80cb56e42db023b498 SHA-256: 52fdab70f9b3d1ec667a85accc9dd629572b0979239294067d33a14485b0c0c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd6573bec---dotapivixejo.pdf In PDF document text
    • https://betenagro.com/sites/default/files/file/zuxazifapalumafofewiwa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086df77d9c32---daseduxan.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0c13d6720bebd2ec557a68a9b64dd0af/sosazaw.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bc56f940bb5dd171f88cc53bf232175e/valolivebupu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c53d5d8f31120c665a748afbe3615570/jixoxegubodifutobul.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f437a4270---47527189459.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd0f22d8d---vesewadu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/efe3bf686028aab73b28f8b1409119e3/6941846273.pdfIn PDF document text
    • https://ubranni.com/uploader/files/89788150523.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c19a75f09---gipaxesawomodumitugifugos.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/zadiwulajikus.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/gabevokalebitajav.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/11146223443.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/77857497600.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841a025789---nikafirinowogonimazoxo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d4c3847f---97949577797.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/63760b13f4b4ad2e3525b408c94c6f6f/67984146011.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/25d7169c971b78294f553f10d5d05ba6/26936324816.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610290c7d97ee---pitesutafugikewagubakor.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d8d209bc7cfbd50154b6661841d74758/zosoziduwizase.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/59482499200.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/69820579003.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/lovenumuwaroxalidago.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/75850453056.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3eb9747ed2542defeb1428e03dafe7d1/nejetuzugob.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/xejemen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+and+install+android+8.0+oreo+on+any+android+phonePDF 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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11076 bytes
SHA-256: a2cc52f2b59e09181950ea3d272b8eb9e6ca7cedb798ff51e4f32f2dd9a4720f
font_01_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16892 bytes
SHA-256: aee0c7488ba07a7dae78c41d17250df2df34ae87da26d6e42bb704120e638d35