PDF malware analysis — malicious · 92824abcce1c7419

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 00:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 17400ddc9b6ed38bfd65acd43c19f7da SHA-1: 4cb9a2515e2e397f62c797ad9548ebfa373bd2df SHA-256: 92824abcce1c74199d55c4647b5b8d199aa2abff79d8b39cde25cfb658f07bb1

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/18562362413.pdf In PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0596076a9544ecba833d2558f21fd259/75130478907.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed9f08ac3540833d894da307567a0998/69088026924.pdfIn PDF document text
- http://mallenmediations.com/mallenmediations/images/userfiles/file/14664745333.pdfIn PDF document text
- https://tomas-music.com/contents//files/lowudumatub.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/591ca0590109c9a9e7b4abacf9055ffb/13255320848.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3k22d1hfou9p53moel2vcuv380/bodosasogiworuxotiwotot.pdfIn PDF document text
- https://fwstc.in/userfiles/file/16387192033.pdfIn PDF document text
- http://standrewsparishhighschoolclassof1964.com/clients/70428/File/81186451402.pdfIn PDF document text
- https://alwillislifecenter.org/ckfinder/userfiles/files/tekixajadozom.pdfIn PDF document text
- http://wecans.net/_UploadFile/Images/file/kevapaseberapasikelabe.pdfIn PDF document text
- http://architettoletiziamasciotta.eu/userfiles/files/30880714252.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607027bc00ffc---26753958879.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec5777edf---zugaxufisakopimirufas.pdfIn PDF document text
- http://megalaserasia.com/upload///79631538157.pdfIn PDF document text
- http://haliburtonhighlandsheritage.ca/userfiles/file/48344897344.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3cbfc57df---8339941547.pdfIn PDF document text
- http://studiolaviano.it/userfiles/files/7988600018.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f637d71a---9974769359.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f244d37df98a6f13dca292fd05159846/77891651028.pdfIn PDF document text
- https://cowichanmusicfestival.com/userfiles/file/30958740513.pdfIn PDF document text
- https://yenhuy.vn/upload/files/nodajipiwaxijix.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/venelaxeka.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/duxofedevo.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/nadokebaganuzetag.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=public+administration+books+for+css+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e56e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE56E	19976 bytes
SHA-256: `89137dce385f8cde4601c64f72597849392fc69af8878164ce69b18c301b02be`
`font_02_sfnt_off000118d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118D5	10980 bytes
SHA-256: `3ca29c1546d30d1a303f726dba7bc276330bc9d85bd3935bf7872cdc7d72333f`

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