Malicious PDF — malware analysis report

Static analysis result for SHA-256 a419fc84aac1f952…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21ac50eb9c634d1eb3ced11aa8091a52 SHA-1: 1e991a4341e3766596235799142c98876d70f6b4 SHA-256: a419fc84aac1f9526b5344cae76b99af01bfe1ffe80ec7c3557dd4aeaea1fb23
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=circuitos+electricos+schaum+pdf PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4522352d3---bovuda.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/pinejawejaxinuwos.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/watomimabobim.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rcq0mq1hbsvdnh4dm16708chsd/bokudepafaxafadedavozirit.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/71173106734.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/42057322562.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nijujekigeno.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/laridexivaz.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/48137845726.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pcmjh3h8psubn9u46968utjsmq/vosilefot.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wokezelozuvu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8h0mj57h237ameo0oqtqabfeev/58997045366.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb61b90fc3---tikixojeda.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607768893e605---nidojuvuruvekepuni.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/64941381586.pdfIn PDF document text
    • http://talleresjpg.es/img/file/jowivugegemebomosifax.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/70087399212.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/70289106543.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4429b08---winasewufizopokomadulob.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/fovokebiwikikezup.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p7ibe113gnnoh5auct562fbsep/dopadasejivijom.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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 16696 bytes
SHA-256: 9063e9b0072a6a012825bbff1a84144a76869961b32c0eb699be130796739a34
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 10912 bytes
SHA-256: 2b967a4b8d9c390e1c4515366e86f837b1388f9103c1f38c3dc11a37e2d37df5
font_02_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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