PDF malware analysis — malicious · 16e942174fa20a1c

MALICIOUS

PDF

96.7 KB Created: 2021-07-02 05:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4483626e8f86291f4549d3fcc5587c0e SHA-1: 5a632044b00a538d8574bbd277036b2058fc43e4 SHA-256: 16e942174fa20a1c5c55445eaae6bef2dd793c2d97c6e06979cf95578a996ae4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the primary attack pattern involves redirecting users through a network of compromised URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

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://smidgel.ru/uplcv?utm_term=procreate+without+pencil PDF link annotation
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6954bd9c4bbfb34221ec00809773d12a/15281150150.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/65151917698.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dd789f04---pezeba.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f422934955---58649344585.pdfIn PDF document text
- https://readandenjoy.ae/userfiles/files/pegejipipofupaxojugakotuw.pdfIn PDF document text
- http://kyanite.tv/userfiles/file/3980760877.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a9q2c6252pbek464eelf99t19e/34644330020.pdfIn PDF document text
- http://akvari-um.ru/userfiles/file/50698007902.pdfIn PDF document text
- https://weeb.nu/userfiles/file/buduxibomukoduvogubowovub.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c5732873---7054500148.pdfIn PDF document text
- https://jcpcdesign.com/upload/ckfinder_temp/files/20210702031431.pdfIn PDF document text
- http://gospel-pour-100-voix.com/fichiers/newsletter/file/49714044213.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4c76a65e---pefofagexajipusojag.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/69nfurrl2vvdtqmc9niahrehq9/lilatibafuso.pdfIn PDF document text
- http://apexnepaltravel.com/userfiles/file/38646560475.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/bugewa.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a9e5881635621902e3565b1dbf382306/lixiduwokuv.pdfIn PDF document text
- http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6ba5d715a870f6341bcbb65c5c9aa0c3/51184589137.pdfIn PDF document text
- http://giftboxvietthuy.com/upload/ck/files/96141393812.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f1khao0gko9gbe5l10k3luhqvp/boxok.pdfIn PDF document text
- http://jnafarms.com/clients/864068/File/64649134548.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0215ed3c---pototutobonosamap.pdfIn PDF document text
- https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0ad67bfdb3172dc94c043c6af1a7f340/makakezekebivevuwog.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/tuwiloji.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fc0d9f1e---dolukovinevipikabexodovug.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d0142765263b2c2ac4866d9a64c5e3ce/taxefik.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a5e3ed54f90d102f90df5610a3e126af/69070542481.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0001192d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1192D	10492 bytes
SHA-256: `df49e97a78845fb2a5a83caa64b3554f1b9c024276a2b8a69438577cb8795413`
`font_01_sfnt_off000130fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130FA	17064 bytes
SHA-256: `3e889ccd63be16344066d00781a86886c7e90d64057b7229146060438f397548`
`font_02_sfnt_off00015d4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15D4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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