Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ad32f172e253ed…

MALICIOUS

PDF

97.8 KB Created: 2021-08-16 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46ab8785f89524cbf48134e322e538c2 SHA-1: 494ac1a21f9c6d1e104b61477a6c8e8fdd0328d1 SHA-256: 52ad32f172e253eda0e9025a82026a156b0d70c50d6f983269db4774ec00c2e7
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 multiple distinct hosts, with several identified as compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tai-group.com/upload/files/16051373132.pdf In PDF document text
    • http://j1medical.com/uploaded/file/vetagilobogaludutizageb.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/60214568260.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5630152703b3a40609e45d2c1ff7bff6/53728806923.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/tanup.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/75073668552.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/mobuwaxudag.pdfIn PDF document text
    • https://digireg.se/upload/tumufadarud.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e6fc7a2f---xevasemodawidavumomenafu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af99beafe89---rinikuwe.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tepubilo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/vawoxanojaxilimafimofan.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/nasibipozug.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021060707494225883.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2d88nelng5dc73mvlil67v7ia5/xanuzav.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e1979073---nilibibogoruwusiv.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e71babb32---jilavezepukun.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52872660271.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/novorewigimuwamatinimise.pdfIn PDF document text
    • http://land89.com/ckupload/files/nevedos.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114631d5d758---64935727295.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86936a36260ff8b37640ac15890f7e9/77693312644.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/80425334669.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e51041b708d---dagorobagipezepasuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=powerflex+525+fault+code+114PDF 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_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 10776 bytes
SHA-256: 8331a66e84ff985c8e5ff7cba6e30b4b276692687c04889fa6603812069c1662
font_01_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 18148 bytes
SHA-256: 4f886b547242a9a157e361ad205d4d2a97b9d25177a4d218971235d7ca71a9a6
font_02_sfnt_off00016105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1