Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b06330b30816b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 11:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f791d6d00fb8047826431ae6cf4b61a0 SHA-1: 86d53eb56fa2f23bc06e1e38adb2676a963d02fa SHA-256: 549b06330b30816b87d1d64b04b50ba3b456c95c280778e8d1df205b0e2df260
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are indicative of an attempt to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=gerald%27s+game+pdf+free+download PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161306d2020cf7---36979298328.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/71072534525.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da24f0b2d3---galakexegalofapupodot.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/84574337376.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd10aa4bf---lonivepevogiz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/52147a0587f9d132fd97ce4f897f54c0/17468519669.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqibdt15la4br3svm8bct2vi8n/48148438896.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae54f13a0e8---zufusadujakenuderolisuwil.pdfIn PDF document text
    • http://thongthien.vn/upload/files/53518070348.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d942f5c489---petotofiwizimewifogif.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/tasokokutefo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/fewizogitufazojijem.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g2qk405i1knbctc8icr2evst8n/14921796357.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210606_F225CA1E197F592F.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tavedixufajotunamun.pdfIn PDF document text
    • http://fedime.org/imagenes/91406542896.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nitewajajo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/70115912834.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/77805593466.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d966daa---90485360349.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/beriko.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/2217db6ef5fd93f4489ded9e46fc067b.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/74122509061.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/82175689903.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/piduxade.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10808 bytes
SHA-256: ef0b5e61a8756b524af9b06bc5dbb42e34ed5c1100c2979020866f51b09866a0
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 18680 bytes
SHA-256: 67672df0b8992288b5fcad397b43e852c29b3e92683ed32238b0b0b82c12768a

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