PDF malware analysis — malicious · 41f4aa3a2d3d431d

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: caf5d8ff7fb90bb87ebf0059b194ca34 SHA-1: 5828cf992e4aca22ca04ae588a2db17ecf5a96e4 SHA-256: 41f4aa3a2d3d431db3bb0bddc6f61c464796d6c82d01610ce18ea9cbd344b61c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

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.
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://studioriggio.it/userfiles/files/rezakevolajafidoxid.pdf In PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76d179a1295d1a3788b586ed2982097f/83472675231.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a1ea2e65---lazike.pdfIn PDF document text
- http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/sifulolujetegogofesot.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9f8660b0d01ef4622e8a397e7d038668/bitulafubagujovo.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085126630b28---fazofazudoxirijexoxilad.pdfIn PDF document text
- http://yesilderecine.com/admin/editor_resim/file/32717451452.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708a46ace6c---vagudumizigo.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff93f77772---fanexedagizerebe.pdfIn PDF document text
- http://banghetretruc.com/media/ftp/file/tajegavilogakufebesiko.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5025caf5---65488588518.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ea6893cb7cfed910e4fed8106152bca3/lipadikizokanepuguk.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/o0r76osj6hk7tldaancvr8esiv/bapesi.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608464d4156ec---vuzerabunisenugoximogejul.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b00651d05---webogimaw.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2g5s11jkckomda8ot01i25oep1/gejexoru.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086929fd0bd4---tiwijezelemumafav.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee575b70914---dufaro.pdfIn PDF document text
- https://aviatroglo.fr/IMG/file/nekuvenufatevukufufot.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ffeca0f6d6a63f4b7c6c35de02b30127/24069311444.pdfIn PDF document text
- http://cfacgroupe.com/uploads/FCK_files/file/jevadamurepozawebamu.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786805c302e---64663129628.pdfIn PDF document text
- http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/majozevujozudagixorogez.pdfIn PDF document text
- https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/594b01b0fd0f50b93f450aebc61a24b7/72216298645.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fef6e95b4---65021915442.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=social+studies+answersPDF 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_off0000f20c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF20C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010a1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A1E	17288 bytes
SHA-256: `ee7ab80eb6367bad7e5ec19a7c0d64081d84a83d26f73721a2ad45d81be61e56`
`font_02_sfnt_off0001370f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1370F	10624 bytes
SHA-256: `f12a78a4d2719ff4c182ba95b9965a599da49361c06db2cf4fd9599cd60e3dc4`

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