PDF malware analysis — malicious · 0e4cd71d4d26bc40

MALICIOUS

PDF

83.1 KB Created: 2021-07-30 12:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 5dc89c212f1ee70568f220d4382194a5 SHA-1: 0313f5117b8ff3915293108d68823ec68ee1a34e SHA-256: 0e4cd71d4d26bc40358003365fbbd0f98d4d20cf44d73c305da92934e3acb63b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=que+es+suma+de+fracciones+heterogeneas PDF link annotation
- https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc2e4bb20---tinofijigik.pdfIn PDF document text
- https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ro95ur49i51dkm1q5g446tb2lr/43574769319.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dgd5fp0fpadmg1o3qsdgukelqj/5380089973.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/42995f8754fa470e764fe237a0eaece1/3882645505.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lvn7ss1s0hsvpn208sscoj6c0e/41749483530.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sd4mos1tt0qchpdov4rtosb6q2/raguz.pdfIn PDF document text
- http://sivam.pl/files/file/57059735564.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3snq51imcd80mbbr4v7pjeeg6r/sedarowenexuzevipogopov.pdfIn PDF document text
- http://ags-sib.ru/ckfinder/userfiles/files/24161644451.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ebad75ad---95695636100.pdfIn PDF document text
- https://etimes.mn/uploads/files/34128416185.pdfIn PDF document text
- http://unsersohn.ch/images/file/78629813355.pdfIn PDF document text
- http://thuephotocopytaihanoi.com/upload/files/bozofite.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/18d08c10b7ca90d3e5afdf18e0f46c48/fenoruwazazisixopudurez.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2b058d53c261c5ce995342a46750732f/woxefo.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/967438640c0ada92dc079504678537ae/88829912587.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/nuvotizasonuvitekej.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f592b038a---poburud.pdfIn PDF document text
- http://billedbutikken.dk/articlefiles/file/2755472837.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8bf39a32d---nepiwumu.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cbc84082---44560572670.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20796a1b03---64390708729.pdfIn PDF document text
- http://casier-a-bouteilles.fr/file/bapopix.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_off0000dcb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCB4	18296 bytes
SHA-256: `d12e14ef1a17edff5b3b9ad6d8906c9c5b4c14d98735b1532abe24968f82717e`
`font_01_sfnt_off00010be5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BE5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123FC	11036 bytes
SHA-256: `c674699c8935f96a84dcdd09463ce188a62f5304008de49829ee04cee46b74c5`

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