Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccc836cecbc48cf…

MALICIOUS

PDF

71.7 KB Created: 2021-08-28 04:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 43ebf18b01852aca673be6c983c3310e SHA-1: 9e79c6843f36375f60a55c0cf5bf4a2ae4b8508d SHA-256: dccc836cecbc48cfc1ea061d55bfcc24d0e2a3b5961a6e7c90f3736bcef39625
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9948e6b5345d49f5a4229db86f7e0963/kobutakaw.pdf In PDF document text
    • https://michelbarbot.com/upload/files/gebezitivufaseji.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66fbcfa10---1980650674.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/xomebulizutome.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf6b179b1f---vudesadumojozitegelim.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/ximenewewomiri.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/memaxabobazoxugima.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/bilevemelazo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107c8ed088---pebixude.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/61372594695.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bb400c639805b91bb16d9646e3e9d5a/95805866724.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/825f55d7cf5de82942d8fd34696a3033/18373285283.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/54029590140.pdfIn PDF document text
    • http://www.moyekolodin.com/files/79391254822.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/wumumekupuwokopa.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/turopetefon.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde9635385---xibizulaworavowo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeeef06128---mazobilemadorikurekowubos.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/wasovisuvepa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0d6c7a80e---fadifodilewoletu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/sajaxusazisixiworadadiru.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684b7cff2e---63103354373.pdfIn PDF document text
    • http://4bx.pl/public/file/54686701223.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/bifigolofulemekexeliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=soft+swelling+in+neckPDF 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_off0000bc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 14484 bytes
SHA-256: f42ab9dcd2311e38f615759f6a45d24bcb01ebd918104a965398b173d916a6df
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10500 bytes
SHA-256: 9eba75e2dca811276715d8290cdad70b5e0bedbed5d4ab78f5dc6e9492cbcbf4

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