Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d93b97b782f52f…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 04:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7dda675bec75b684d8d17517c8e8dd4 SHA-1: 8c3edd1fff6d1b79b61f923cdb069b5f56a108aa SHA-256: a7d93b97b782f52fe906ddc5f114c08aad64b16a3fbb93fc4d0d52a7a5687d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites, leveraging compromised hosting for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=can+i+eat+fruits+at+night
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e6177730818fa6806ad3932ba63eede5/botodo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5aac61d8---nawokufosugeru.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/roledulen.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/77e71aeac7318ef0d448b6fcc828e083/sutavo.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/btg70iujkkin8r8bhs5riqor20/38067422285.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/78fe2fc580bcc1f94fcd85ac122111eb/gigitapufiwojized.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f1d5775735705bfbac187b1ba5bc4e19/juwisuginezitudaxarokuwud.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a53167d63---82347547208.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cc8a08c5---fitesevojilipejinomijeku.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/bepj8e989mgnplg54vnqt8snst/dudesipa.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e37ccda78e7d237f3cd69216a2f7df4d/xikez.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8305e9a0d---1818859820.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb0239124---55632949714.pdf
    • http://agarimo.com/archivos/archivos/45966966236.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607771e8673d8---43554322682.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210617_922C18F02115E541.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160744c3440145---80469515537.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080e75de61d1---98800635773.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbb65b071---jizowirawedapavudimisikof.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/88b726831dd4a0e496b8530c299c1c94/64692298525.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28498bf2eb---jiranavejapofesuxilava.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6d9dbff---demerixezode.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a194d6514f82cded064212d88f9312a0/kuletitofawutepabamovu.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/33571929233.pdf
    • http://sicompk.com/survey/userfiles/files/lotirewadedasedotelenal.pdf
    • http://martom24.pl/martom/userfiles/file/repemoxoje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16792 bytes
font_01_sfnt_off00011896.bin
5171efce1882bc4a7eea4d03161ce45566570d7d867b8fdca1516baa5f490819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 17608 bytes
font_02_sfnt_off000146f1.bin
bfa34c00fb3728c8b5a4172079726872ea14a7d20a9da44fec03e0edc1e75703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 10460 bytes

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