Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8882540de30327e…

MALICIOUS

PDF

93.5 KB Created: 2021-08-14 00:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5142922bedd1057b5cc4dc3f2d200bb9 SHA-1: fd8fb37c2e8c10673189ddf63ed5664d90e24c25 SHA-256: a8882540de30327e16cb81c8473870f5ad46838d063cdadebbf124de8a90ca5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=best+exercise+plan+to+lose+weight+and+tone+up PDF link annotation
    • http://portamarioarchitetto.eu/userfiles/files/zosix.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/41728200916.pdfIn PDF document text
    • http://imaginove.eu/data/Files/94003184362.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/doboditadiwuxemi.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/mebobomugigomusow.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/gefukubuwajojosom.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/crf9rqnfc257tq2l0p6ue9umc0/79818225075.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bc5aa773b92841b5f9694efaeab140e/xarexonoja.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e8352530---zudev.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef424c779a---fivuxurezegu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/60685697535.pdfIn PDF document text
    • http://nfc.soo.jp/file/86331769149.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c4dd3041ecf604fdf095072892c9c59/dazovimumigesalad.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160949d30481f0---14601470334.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3ed9b456---86116273976.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111f487594e9---75670413796.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zuzoretibatapojuta.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/51706969923.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3154f3398---zokuxewixaxidizefukalape.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/66154639217.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/zurogijulafel.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/93146092789.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/33312291152.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760eeb01049---xebafosiraku.pdfIn PDF document text
    • http://abnicum.com/files/file/fevogoviwaguvudufivige.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1067cfa974c22e44772497f0576f9b26/zudemusebepusovafe.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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 11136 bytes
SHA-256: 8d78305e3ff23f96958b4784d9c7a6a1033487eed9efd623b07724335aede628
font_01_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 17292 bytes
SHA-256: 0c35c2d8f9cb10fd04ec20fbd4e37fab6a693c1c5646351117dba09b304375bc
font_02_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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