PDF malware analysis — malicious · 78a83cd54274bae5

MALICIOUS

PDF

72.3 KB Created: 2021-07-03 11:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 4228ff4575005ad569bd939f700127c3 SHA-1: 25b1a0a935d691a02539cb16b59ff44a8341fdf7 SHA-256: 78a83cd54274bae5adff9db87f28aa4f63b9e0ec94463f74be3a76cdd940086a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a PDF phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to leverage search engine optimization or disposable hosting for malicious redirects. While no scripts were explicitly extracted, the nature of the heuristics and the PDF format suggest potential for embedded JavaScript to facilitate the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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=long+island+clothiers PDF link annotation
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dfa398394975682945b19074ab126642/vufokakarikekipobep.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/98028717779.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812911d0767---jiwerorotu.pdfIn PDF document text
- http://vipnjl.com/userfiles/files/35904916968.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e30f21f5f---bevosimoxi.pdfIn PDF document text
- https://bednidhitraders.com/userfiles/file/wixubuxesesekagusule.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba20c5a6e---wunawobuforaneze.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099f142e2259---jozagibugitinu.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb574eb2141---11495858223.pdfIn PDF document text
- https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2e89a96ad6ca6e7b49d505223553e1/mefabigokogagetivekavu.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9c9a2fd01c9ca6f0e34fae145b6c1372/bubajowozekoxivobijug.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa21b78abe---fofilomajozij.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/file/fuleve.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb60f2c4e3---54173233950.pdfIn PDF document text
- http://worldofpacifiers.com/editor_uploads/system/files/xakivivivanixel.pdfIn PDF document text
- http://abimobiliare.pl/pliki/File/refagubedujokuganu.pdfIn PDF document text
- http://laweasy.kr/userfiles/file/5775593540.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2366a993---86585070555.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee661a63a---58903171637.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c7b042ca3e6db99cca0da95db880edb/12743792896.pdfIn PDF document text
- http://moreit.ch/productinfo/file/dozigagip.pdfIn PDF document text
- http://christschoolblr.in/userfiles/file/9258263313.pdfIn PDF document text
- https://burlingame.com/wysiwygfiles/file/58725347381.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df60af1f2cb8e9567fa20dd534918056/8553194368.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0b5815a2884b2493e8861c52594a4c9c/92261139428.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_off0000bbc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBC9	10608 bytes
SHA-256: `9fee84398e73a08ec518f2efd3c6191382a30b06b13751bd43360a84e2a43c72`
`font_01_sfnt_off0000d3c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3C6	15708 bytes
SHA-256: `7ee06d40dee6a1989af8c294e8f15958cdd4c4a6073e3a5450540a488d14e343`
`font_02_sfnt_off0000fc2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC2B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.