Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1cfc6cc57a0ba0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 21:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0986debd4675dc0eb9cec194f00661cc SHA-1: a0ca0c74147418c0c28c39ae87813cf63a37228b SHA-256: 1a1cfc6cc57a0ba05c8c0a4a1e6b42db23d74c7d6cda3aeb4202a87df6f63f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of embedded URLs and the nature of the link farm suggest the primary goal is to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=1on1+basketball+unblocked PDF link annotation
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4c594eb3175e200a494e1f17bd94a4d9/sujesibojatusomewiba.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a391c0291e4f322239f64cd8037a8482/garigivekedavorukedi.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/karolokesiwuvinopejedaz.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/wazalom.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fonupejab.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210917_181559.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/26997100684.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141129e89084---81685841839.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/64175651903.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadisoradazarupofizok.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/gugazimax.pdfIn PDF document text
    • http://matras-devison.com/upload/file/18302044346.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/25428839174.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xitokivi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/79456564576.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/23296556343.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/tusagexapikosej.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402e685fabb---29458657018.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/panosum.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/wolumigowirakanizixaxuxaw.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/344aec01344494e906407be9a6a9b8b7/muruluzupiro.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6f81f64a1ba78cd9989d56a575fc3a3d/debur.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/30592303326.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/28251084513.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/visivib.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/66124689993.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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 15928 bytes
SHA-256: 25cac046518bd312c317ec4c36455d3430524700c3968ae04ae269e303d6d01e
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 10456 bytes
SHA-256: ec28cef1fa6a1c47217e6725fbafb92c1c5379c9d5ad04e9602d5b8533095596
font_02_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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