Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e21b255ad121441…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01c9074da80280424d820d02ac9608f6 SHA-1: cce2fd588d3f91b880faa3470e80d0d106a8409a SHA-256: 3e21b255ad12144103e4624e6f15cdb1f0d5d087a26841b3ee1295dc454fb013
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings suggest the primary function is to redirect users through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ikitellirezistans.com/upload/files/nugawumimawetixadufiko.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160847be7bf279---boxenubivakiximudi.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/51761269377.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/25810886503.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/xixukanogoxubujuxap.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/29259901629.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dp52g9fi36hbo0m6e3lvko4vi6/tatuxukajelikapixox.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jesudoxuxijobelofobu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/34579943336.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/70116305033.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/zumijixokikefaxeduzixun.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/revabisagabu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mawibumekegi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/99015200039.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a41fa1e6e---sapugunugodokun.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3379519140---petetigekoweg.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/noberefirepirapunijobexev.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162141569625.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3044e7f212---11731942797.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa186614a2e---78679520464.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u3c91m6jf1qhabtrnp81gjqv8i/zegila.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9cf0af8694932addc60504e48a5c3951/jivunowuduzetaza.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0da5eedb---12431923526.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/27265377187.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/55259833473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=counselor+at+law+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fe12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE12 17344 bytes
SHA-256: 4da919b95d53c7dae80348c3520cf1d80305e7609755f675135c4ad779ce0b65
font_00_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 10668 bytes
SHA-256: b64326001c5881765238ce2ca720ac01b936b467b22a8aa5e1224c83cad0bcf9
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16544 bytes
SHA-256: 01eb9da946fc81c08a95a0407577c1bb39d7cbd7c35d72de9bab86636cdc8864

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