Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebadcd1e984cf52…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7c4b511f5d7597278a588edc97ebacd SHA-1: 804a1d9bb38212995c192d604d2d1e40c1ea89d4 SHA-256: 3ebadcd1e984cf5282360d6d772fae2323a85ec2ba4bcd8e8cee7a14d5f58fc1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many hosted on compromised or disposable domains. The presence of numerous URLs, including those pointing to compromised WordPress uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=millipore+filter+integrity+tester+manual PDF link annotation
    • https://aynadakikemalizm.com/resimler/files/sujajipunafurekimigozepi.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/63229014266.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/29124065325.pdfIn PDF document text
    • http://russia-ex.com/34645405693.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/87323686752.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66674c64b0---voxef.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09e97c534---62024731073.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/divuderitujimoruwegifigob.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/7873614767ed8a76d143cb62b894500e/fipadikomokonamolegari.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a56ea48a8ac49a2b3eb5e5be06d8b8fa/51029120668.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/08231ddae3b2f1423baa53810a660d09/87495135735.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be1baf2d17e---nolugimatukovirav.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1ebea4366e281d1ed8378f752f619797/vikez.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/larepibometejofawuvuwava.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6e0ae17d---91968116339.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/43420364846.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/61155073732.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/31621272542.pdfIn PDF document text
    • https://harom.ro/files/file/90864580846.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6irvhgjosqtvkl7tc636s63ogp/1899676384.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/41336442316.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vscpj3e9iv54mkjbsuehd0bj64/kojinamigepawomepovib.pdfIn PDF document text
    • https://digireg.org/upload/fusujogawotobo.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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 19520 bytes
SHA-256: 0b0ed3a82602f267f04a33f82cfb4466d54260eab6d887191baf742257637d39
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 10908 bytes
SHA-256: d4b420457693214d68e36372b9ae50b2291f8ba215c7425f4ebaf1a99a3ba26c

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