Malicious PDF — malware analysis report

Static analysis result for SHA-256 01877997994046b0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34ff1b65ee5cd37572c50c501179975d SHA-1: a4f17c5865447d530074c55f5ed295f4ffef6784 SHA-256: 01877997994046b0afaa69c1bff530934f795c5bebd250fd5b1102665493892c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/85165704223.pdf In PDF document text
    • http://lidaoxc.com/upload/files/vifajuvoduginagarapa.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/47034107836.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/91748754281.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/17895967962.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/46693995238.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/27830679629.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/34917986860.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/eb9e5b1c815cc1e0289003053ec0c496/23943943639.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/23525100909.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/33640086992.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/45769015210.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2cb692bc3fab46240ab1c8d20391ef9a/33289975932.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zavuxu.pdfIn PDF document text
    • http://santeh.md/img/files/11666239621.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/57355517587.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161377046ca63d---88130711172.pdfIn PDF document text
    • http://gosapahostel.com/userfiles/file/kabukumomavarujemomiru.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/60254718152.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/rizoxibenefamakofaz.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/xinosafaga.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/ronijakigajosilujevobiw.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/48532078748.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fulogubepina.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/93391383204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hollywood+movies+download+app+apkPDF 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_off0000b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB064 17356 bytes
SHA-256: 9a7a96b6cd75609829940ce091261908bb98961109c752e46d5c045e553a3306
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10704 bytes
SHA-256: c92251dc45e2b3d97fed306fc0af16360448362b020e13e3aa6934f3162c0562

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