PDF malware analysis — malicious · 51837039b85a2bdb

MALICIOUS

PDF

92.1 KB Created: 2021-07-10 11:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 76b3f23a3a06b0058059ea68b076f0f6 SHA-1: a6dd6cc883ec48ee7463e5eb8e72e55fc9eeced3 SHA-256: 51837039b85a2bdb8ef7d3104471cc291c8eff06996bebedbfc595484a933dc4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URLs are indicative of a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://synerhu.ru/uplcv?utm_term=plato%27s+view+on+knowledge PDF link annotation
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4452f2a217de74b8a6c924e0e113b0e2/vedumijoseki.pdfIn PDF document text
- http://pratiklinik.com/img/userfiles/files/67701372186.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a69b7ebc2---4413289314.pdfIn PDF document text
- https://wrd13.com/force/file/dasamibevi.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0rgcp00dqnsi4ijrcfoeqggghh/3369166443.pdfIn PDF document text
- http://csc0535.com/userfiles/file/20210613161311_uw9pc0.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fe573abe---31741705996.pdfIn PDF document text
- http://aktifithalat.com/resimlerfiles/javeroxuv.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160987ded64287---teramujarabepupogonikex.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce49a6f30c7d534b7880f6a54a33f10b/sodewug.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d96407e2d---befakenasuraperew.pdfIn PDF document text
- https://rieker-consulting.eu/files/file/79716503724.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d724e5766a171057a76330a20b59406e/41321782612.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/41330620739.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab864aa9ad4---32431327416.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/80983945270.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e0340f50---81478766668.pdfIn PDF document text
- http://ciskmv.com/css/file/barogafidusumewilime.pdfIn PDF document text
- http://prtourusa.com/FileData/ckfinder/files/20210622_AC2EF025A452FB79.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c714909b43---nafufakomexenut.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/lokabux.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g85dj9j3k27ob87k9fcfu9rmp3/6751631205.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ggct4do2tidhr41vh9ufntf44b/45685328813.pdfIn PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d35fa92be26932255b949ddfc20af991/kejisewan.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB8E	18868 bytes
SHA-256: `c64fa05c2f04a7845d79c343230ceaa75ca353d7f18874983ced7bde397a2243`
`font_01_sfnt_off00011cc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC6	10600 bytes
SHA-256: `57e4108d6e2d4cddeeb6da6fdec9ec281edce8efec6c282ba3b18dda2a47d557`
`font_02_sfnt_off00013511.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13511	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014d22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D22	16096 bytes
SHA-256: `4ba2f64648f3913d62e340dbcfb60868d09d2a275a626c0843c73eb1759bed3a`

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