Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f46b496daf739e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 20:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b8eb6fe0eb3bc186b25e0f9a1ccae32 SHA-1: 5aada8d6eec2d5f0e00582b73f4498da0f7cb04f SHA-256: c6f46b496daf739ea7f60778d844006c989509386d4f06b2b0950ee1955a81de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is likely designed to exploit vulnerabilities or redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=download+pdf+reader+for+windows+10+32+bit PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6d5118fe23a686293312158342d31a76/lexebamowapekapuni.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/60664694875.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/redupibagowozebuvatep.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/11104292623.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160993c675152a---91717774779.pdfIn PDF document text
    • https://webmenuplus.com/images/file/70433034283.pdfIn PDF document text
    • http://scantech3d.com/files/39360997284.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/83162748469.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fojobizijipenonaxu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/40443133033.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/51330572504.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/54e3ueuj7ieeeahm8klvla5lt2/wates.pdfIn PDF document text
    • http://packamate.com/userfiles/22838966892.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e6f117f7---41615832830.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0be39f994---jajipekaralepe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/titasoligifixopiwu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/17180157135.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pinizekidozavu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613237ee4e074---44553950150.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/juvetameganuvulon.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/40742468900.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/zajozatuj.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/th81jd55fhra492tuqjh03nf0c/wedakaturevim.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/kijujudorole.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1eedde803---51995214895.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_off0000b9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B3 11184 bytes
SHA-256: c1933d25f3a21e25d3e3cdc2f43d4735205da9e944f17c0fa07981776c1b6d22
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16156 bytes
SHA-256: b807ec80d7e6fb19d3433605d86c3aa32209e9db28185617f96228703f778901
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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