Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf023bc38d99eb5…

MALICIOUS

PDF

103.6 KB Created: 2021-08-03 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: edb656b90777a3d0fcfb09984260afb2 SHA-1: 4fcff1c5b3e5ad061587d766e561a9f8386a1fcb SHA-256: 8cf023bc38d99eb5ede3c47c9e3c3092d9ba3b0c0ebf135dba3f9aca2f93862a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nomylo.ru/uplcv?utm_term=wolf+of+wall+street+google+drive+mp3 PDF link annotation
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/dimr2ft1s9snlo2s8hkcckge4u/90635066098.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48c377613---93674769744.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mktisiggl6sihqcu57n3akmg86/nuzeluronujovuwubano.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609828130e4e2---83651257655.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/39085990184.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c81vp494084mlp98krgltql1nq/94433970235.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91e0bb9b2---zidovasanifuzoruk.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/80759447525.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5psskanqnig5f23rf8aa850gs5/zabazeterusigixuf.pdfIn PDF document text
    • https://designclarf.it/file/jitekutitenupikofazope.pdfIn PDF document text
    • https://soliangco.com/contents//files/gekuguruv.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/bawidimizowavivixubomo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e41a2a70f390b7f994811e083abf1dd3/xekevevenuponus.pdfIn PDF document text
    • http://carbonelite.ru/file/gutomatavumof.pdfIn PDF document text
    • http://jarosi.hu/files/file/zisuvemo.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/90504229893.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9e3177e324fddbb604e1393af0c82ce7/pamaruxoberilafu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2sb6ui4tku151l33d3i08adr7s/52911655181.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/97126881257.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/24397695128.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/dusiti.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/lekobezazuzi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dmbids9df1sauluj8gc86fim45/48067084748.pdfIn PDF document text
    • http://rapet.hu/files/netesimovopu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001340f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1340F 18656 bytes
SHA-256: 667ccd8e00c39ab2bff4a239767f1303e2bbbf07ca2e8d1fd3156242efb47b98
font_00_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 20848 bytes
SHA-256: 9c080d59a585b731f79d3920d2a5d80e11be62b962c8e39843a9414b3f0ba215
font_02_sfnt_off0001526b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A78 2704 bytes
SHA-256: 19e3379701295a0d8b1a96b2116ffe00bea3cb63b846bdaba66634477f089a82
font_04_sfnt_off000175a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A2 11052 bytes
SHA-256: b10009f2f6c84b9b1ed113035ed711d4ca034c5be5e12bb760946f87c63d5d05