Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dd87aae1851a02…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 03:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ce31fa2915831611c4397250393aa3f SHA-1: 0c30ff169dc203e87bfea328eb7ca1eb5da549ac SHA-256: 62dd87aae1851a021ee413d975fa2a20a15463c5ce514f1b399388645e34a944
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links point towards it being a lure to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160793d7761b1a---vunavidanujatuwagupuket.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/devubitebidepoduxikojosu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/34579943336.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fasuwuwavu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ce3441d5a---kinipowizutin.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/77832681608.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430165110750501602.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/85c837340f559b772e4068a0363730d6/14281027369.pdfIn PDF document text
    • https://langumeistras.lt/i/File/wixor.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kunukuninogesorugafatane.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bb5d24e9---migiku.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9e348ee75a150ba6b9755abb02b35753/bopefojisazimuvo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/71fbf16cb25da2245e04f2a62ecd8647/sufebezururuxura.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69fb17455---lapokuxefeburesubug.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/rimoduxepaviv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c714015b---39795357910.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5642q429hom487kbmmuel1gfm8/nikidisemaxetugowabedi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/76959332940.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xepum.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/bimilogodisavidolisero.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/57540714447.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/66717726841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grade+7+math+worksheets+multiples+and+factorsPDF 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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 17968 bytes
SHA-256: ddf755e344ea477cad6cdc64370d305a8ad9a41c469e716f33aa28a3176cd87b
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 11252 bytes
SHA-256: 62df790043177d884cddd7886a2edab9b88c3c39d66a1f8ed6fd08be3819b3d8

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