Malicious PDF — malware analysis report

Static analysis result for SHA-256 193f7f474a80fced…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 22:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71dc1c17f86329edabeb47ad413a04f3 SHA-1: 0454405c7cb5b6cbdbad2ff35091ddc7364b797c SHA-256: 193f7f474a80fced44934a7e066b4140ea2499d7c0e06366fc101896c5c5e1c2
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2eb679c3d---zemeketefeboje.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/bowojusikazekurafilaxuvaj.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/92ee2b722e84dbad9af216e2aac8451e/58596351039.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5ee678ebcd583b6066893b15ff90e0b/biravelivi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a05b8678d59647ad2dce4dbcc3ccf95e/3675454973.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/fopuval.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f2d4cdf62---wumegufoviwometosavigiwul.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/909761567.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/lesovumoku.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a35b9b13ce70904a1ac34927cdeb439b/62892386581.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u9ss80k1skuq3nrbt98ug98bmh/12519571621.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/lvmrec1mloijprhvl6okgf8m5q/pekafabapikupa.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/48384012670.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/91800003766.pdfIn PDF document text
    • http://df-2.de/images/daten/file/levizafidelosezijevapig.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/95232116910.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/vemegotug.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608484adb7109---43707527507.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/49689842508.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/sulaxebojefefinaki.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/55070719615.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1vvhni7nnfcbikel1knj0kq436/xamifato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=oxford+latin+dictionary+pdf+free+downloadPDF link annotation
    • 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 17828 bytes
SHA-256: a31d3337f5c5656e1a62ae85322f9c9db27309e1deb83be1677910e3749d6038
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 10772 bytes
SHA-256: 82210f001d94e14b4d4f1e58fe8b642e9a34b26aade9363b2f5cea4308f82403

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