Malicious PDF — malware analysis report

Static analysis result for SHA-256 f395679aa5e91f15…

MALICIOUS

PDF

99.5 KB Created: 2021-06-30 22:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1fc7e05978daf7a097cb1b2363186c9 SHA-1: f6394babb40939cc58ecb54ce3c8af6b70cf44c6 SHA-256: f395679aa5e91f15ec9ff26b10cc9d2b9476e821886795178f50e4d54990e59f
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic by presenting a lure that prompts the user to install a browser extension or update. This is a common method to facilitate the download and execution of malicious payloads or to steal credentials. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution campaign. Although no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=idle+dice+hacked PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/zogosofopowagoj.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/94719434121.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/78637224202.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8645115ad3ae069dc6dcca5dca9fbd57/45699082533.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/385246bade811fdccc53241b37849971/tajalizejoka.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802dd7886c1---9654343995.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210620075714_1396379868.pdfIn PDF document text
    • http://fittbike.hu/files/file/fivajunobipubipufitev.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fcbca022---57164738736.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ca184f88fc6---pofanafupodesojixunale.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/duzujeweruxazatiwi.pdfIn PDF document text
    • http://millecolori.it/images/file/26160757334.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab66e21bc---64085945835.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/diwepenewana.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741d23807e1---kirif.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hv3tf1eaj4gsl93qt4kppkjsb1/76017067344.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/61458318642.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53604173727.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16095001f4c6fd---56581934213.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/08e8f6310745f0deb2a2bdd66d0c9da3/68634746397.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e4c07329---44191803648.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94956919201.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b61e7bc8aa19bb83467f86203f9480/folusefiximudifu.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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 20988 bytes
SHA-256: 99efca10542dfe6db0d977b64451c0c6621a425008c53cba849c2345e1b3cb61
font_02_sfnt_off0001506a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506A 9920 bytes
SHA-256: 095659e986ac6cb25a510113f7223d6ddf903c09ab8efb017cce223f47311a70
font_03_sfnt_off00016653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16653 17436 bytes
SHA-256: 3bdda8ab199a88567de1f22aae4c52863db9c5368ba934b1f5ec12048b3fbd90

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