Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9eb8ab665c96ae…

MALICIOUS

PDF

105.9 KB Created: 2021-09-03 13:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af0d46a780ca85a8479485bec18bc357 SHA-1: cb701bc500c0d33f0b4644d3539cad0b0b5c3ec9 SHA-256: ec9eb8ab665c96ae78454c6afca082c97e50e3d7fd40fd5a46a70cc3ad4da86b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is designed to redirect users to malicious sites. The presence of a 'link farm' on disposable hosting further supports its role in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=8-psk+modulation+pdf PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n5rjlsglop1f6p3q0oq7hifvb4/85323694188.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/nawapakerewavokirapegegot.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/91274648117.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66000818264.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/26770440055.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/1372432364.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce11311544---peduxabaderonibimofapoxel.pdfIn PDF document text
    • http://tai-group.com/upload/files/88906306826.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/66991274083.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/38462762406.pdfIn PDF document text
    • http://saydersan.com/firma/files/79890295760.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/posumidajakuvunajezemu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a708ba6c100---zaximakumasonixarabilezo.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/pigewolini.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/lodanas.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67500019540.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/naxubuwaf.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/regasu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/48070013453.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/96225264484.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df2a07a1eeb---97621053159.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/pugam.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/lowupoku.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_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10764 bytes
SHA-256: 899deb92f077fb51bc7d10bea58c3b70fb7bf885429bf2de056de1eadd925516
font_01_sfnt_off00014bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16406 20656 bytes
SHA-256: e787054f6c604d8707f32e33a29568c656109004886901a35b8b5e3f744e0114