Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a3e3a9a0e6d47d…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 17:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a4865df5b03cf1e317c59ea7429b6b1 SHA-1: d21e59a8de8a50431f9d4bb788d47e23b22f413b SHA-256: c5a3e3a9a0e6d47d149b40c937d407526ffcdca130f6172fb11c33cd5521c16c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=para+que+sirven+las+funciones+trigonom%C3%A9tricas+en+la+vida+cotidiana PDF link annotation
    • http://okwmd.com/upload/fckeditor/file/tebali.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/47754978201.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qbb1ma1hvu1vge4sv0n0s3om09/46267753478.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zekuwo.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/32490208492.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///ganogolafasumokinu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/o9ug9q99kt44n03455af6g9b4q/kagotidevutamopupamaguzo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a865b887d---42341245683.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p36ri8urgriej7bg38erqbed3u/jubexapipulu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/barujibu.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/xafufomira.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/58005625433.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d5328dae---kegokupufubivudepajavog.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/89267687577.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/46cf1f6ab2ddad21f0a7ddf50ba24cf6/45824396181.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f5307ef95464e5a4622b1e54a3b38954/wobogax.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/80005705480.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/37492982377.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v62bktnnnclh9fu37kosh9nll0/66497895316.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b58b3d0d---nugixumamimenezenoj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adba03cbf54---lonozubojo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/17346323124.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/nulopavoxiligepudavudotuz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/73904092556.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_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 16744 bytes
SHA-256: 6bee19c0271de6178f2ef9fd4f3598ca998fc6c1bae5c977e46fb0ecc471f667
font_02_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 11284 bytes
SHA-256: 87e57085bda3b492fa15e8c0b774264596d45a586070a5ad43fe0543323b6b5b

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