Malicious PDF — malware analysis report

Static analysis result for SHA-256 028d49c6faf1c67f…

MALICIOUS

PDF

97.4 KB Created: 2021-08-03 15:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 905f75799d0dfaacc8ad51f190795457 SHA-1: b310a7425ae3403dd92e48429eaa19176d21b9ef SHA-256: 028d49c6faf1c67fcf6c01c61ba04c94b557464e187a1ace99b7ed09775e7c69
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised websites, including one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jenexolofesenezegigozik.pdf In PDF document text
    • http://akbarestate.com/survey/userfiles/files/90074513528.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/82324382834.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/83202361106.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/50755817679.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a0c32c479d9851863b1ce402f84e5bd4/xomenatuxadopin.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/39100704972.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/48919922498.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/segipege.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bejupebuf.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/maujldkme31oqn090elhkau2el/85742285404.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e149f2360---29313959385.pdfIn PDF document text
    • http://lagrupacio.cat/file/pujojuvidovujogugiwix.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/138db5a514d4338495b4fd10754ff318/webededitabenite.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/noxib.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b60c3ca3c---82818106870.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/doxuboxojenaxosuse.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/jotojuzulotogewuwav.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/23436567189.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bu8da9c3jt7iacbj31lab2v5ro/76746456435.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/dulosapevutato.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/55553500138.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b508e476e38---41011763965.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/dawonokuwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mutants+and+masterminds+3e+power+levelPDF 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_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 17516 bytes
SHA-256: 820691d316e9a0ddbc945acfed39357ec0969d5b20cbce5851950c8a95ead926
font_02_sfnt_off00015cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 10968 bytes
SHA-256: 72fefb9d0ddb60f35bbe02877c692851d3470f7b834b866a77a2f6fddf0bed53

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