Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe62077c651d3cb…

MALICIOUS

PDF

91.1 KB Created: 2021-07-13 21:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 35a6e392144a7480100b3454e77bcf2b SHA-1: 6beb6b65f6a1bc68ac64a90b1dc8966d2fc08668 SHA-256: 5fe62077c651d3cb54fd1b0daa5cab56f721976ab9a0beb50d0d1d32b95dd33a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=number+of+protons+and+neutrons+in+magnesium PDF link annotation
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fb9a818015089c0f464b81e249df1318/56934926284.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hnr4vm3h88d60gonf2hm91va10/89319724537.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/i3hlldagt6138m2pq71j94iloc/91480243239.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pefurizoroxubat.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/dizipavofipufokarezolita.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/6974544725.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/52459786819.pdfIn PDF document text
    • http://rilta.net/userfiles/files/furuwuwu.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/12996157650.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/tavas.pdfIn PDF document text
    • http://lucann.com/Upload/file/mafalotadubunaxo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/30196287674.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4e6039e0---95871797019.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s14bccom5cfqb49kqpvf7f1ikq/rofoxatetijek.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/19708284872.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e9f62a74---zabomefovunidazuzogijugiw.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca314156b6---45952191879.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904e0698d0---kisinipifupidimijivuxek.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/91455191047.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da43553d3a---sulirolamubawowubotar.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609643229efd3---64003825276.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/23164282738.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3967d51a---69295133873.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_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 11012 bytes
SHA-256: 3fcc82b262f644485a5383f4eb6b33df583ad331e35dacd00b6a9a740caea7bc
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 17560 bytes
SHA-256: a35e6b07d751993e4dcb7ae1513b5ea8383dba5876531bdba0168a9dd905c55e
font_02_sfnt_off00014693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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