Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d50aa127ec2f5d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 19:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d27f0d3011f2148e0b51b5edb27dec6 SHA-1: 1b5d639ce1fd229faf8d2169fb820c95198b078b SHA-256: 91d50aa127ec2f5d82faf0cfe0eef9a82a0210ec8da8393bc1255f05fab06627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The embedded URLs and link farm structure suggest the primary goal is to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=zkteco+ua300+pdf PDF link annotation
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jqjhgim1iq5nvi36ov0sjbjhep/13756456315.pdfIn PDF document text
    • https://arendic.cl/files/vagasemofifudukavixeme.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zovawajukanofesenigu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dineraripa.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16113d8cd0b2e3---46163116077.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/48552808536.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/89omu297hfipl39fiarvg6tg44/64983198266.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/dipofarojifoxatapegesuvil.pdfIn PDF document text
    • https://people11people.gr/uploads/File/garukut.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78481450634.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/64050344327.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0a938c63e0bd7321c18e17bf965609fa/morukamuxigomonutibid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29357999851.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c048602e---66147459023.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086d673a7704---93404216237.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f746341f6---vazutuxagoxo.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/33389570826.pdfIn PDF document text
    • http://soupworld.de/upload/file/89138277265.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/61653884732.pdfIn PDF document text
    • https://airshow-bg.com/file/22268073840.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1nkdo369nlp6lbol291pmtgs7g/pazamimu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/55799505529.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8d337720---fosizezuribejero.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf81a77458f---metukobemimi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 10552 bytes
SHA-256: abd3f2180c71884ee6412759f7fa2ef7cd43a3806df583d22ea201827e912ada
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 18760 bytes
SHA-256: cc9ec4d951b99272a86054aa396c2f9b2465e7196404d455fa38d5a1abbefbb5
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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