PDF malware analysis — malicious · 35a9c2bb5438f514

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 01:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 11658ef118e186bed336bd33b82e9d74 SHA-1: edb55a4f76443f4e03c40b72bb002d0574a0abe6 SHA-256: 35a9c2bb5438f51453ceab3d0f7e53b534e296e5ef4f6fa53bb36cbb010a7e7a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. Several URLs point to compromised WordPress upload directories, suggesting a pattern of hosting malicious content on compromised infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 https://crewmak.ru/uplcv?utm_term=discrete+cosine+transform+book+pdf PDF link annotation
- https://kajariaadsevents.com/admin/uploads/file/xevokevorukalemume.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10874c60df---29588007589.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7656e7708---35542296627.pdfIn PDF document text
- https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/vikisasezesapadub.pdfIn PDF document text
- http://absigorta.come/file/sumoregilegiteb.pdfIn PDF document text
- http://sanga.asia/userData/board/file/gomevogomumarobad.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0d2f6dcad8046485838f57f4a1364ce9/28156127279.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced00edd1b---kivupimo.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df774e73e42---dibadazekugenutatizazod.pdfIn PDF document text
- http://vssteel1999.com/ckeditor/userfiles/files/63931102078.pdfIn PDF document text
- http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082443e343df---16707602196.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa00aeda7---43593671701.pdfIn PDF document text
- https://artenika.pl/fck/file/vemefavizexe.pdfIn PDF document text
- http://capmar.eu/userfiles/file/visajevojal.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/deqkktqbcm6n44d9s07eds2ou6/kokojiniteninur.pdfIn PDF document text
- https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e01a0260565df8b875e1d8b9a3d6daff/29287161957.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/51383599252.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a17cc4bd---45845134631.pdfIn PDF document text
- https://thuanxuongmonmb.com/admin/webroot/upload/image/files/91556636448.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/026996260ab1023e4b4b633fd874ede7/juzavovipatuvasumixaki.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d90e8f77fb040334fc05950c2240358/75741740636.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff2efb9d2a---netipaxixemuresogofago.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/sutaxasozupelofevewedebe.pdfIn PDF document text
- http://biogenetec.tw/image/files/20210716_202614.pdfIn PDF document text
- http://shukokai-voves.fr/userfiles/file/16275741387.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/73150fe997bbcd9e157a8e020e8b33a9/vedekexu.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/dixujutavanolonoz.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_off0000cecd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCECD	10968 bytes
SHA-256: `e471c78f70c1da5e41ed3b4866ee68fdb8857710f5d86f7965d987f898bd588b`
`font_01_sfnt_off0000e804.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE804	17820 bytes
SHA-256: `5428e4c4260138a5bbb68bd82d10d439e0ee41525e15e410910b2b7d4bd32f46`
`font_02_sfnt_off00011625.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11625	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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