PDF malware analysis — malicious · c544fccca9d3b085

MALICIOUS

PDF

78.1 KB Created: 2021-07-05 20:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: b9d0b0d4dca29e33ed740bdd20ba103e SHA-1: 4677ba82224d2052b591775ee6035d820036fa59 SHA-256: c544fccca9d3b0851ee6101a94f70fb5dc64c411f9e41ed2c6f11958c43ef023

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is used to host numerous URLs designed to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=the+legend+of+korra+free+online+streaming PDF link annotation
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c8298df2cc018b718d870ee1e45ad21a/5523158333.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/fixinero.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/69df46e256b7265439342532a715fa44/16143978223.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/68378095187.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70d545fbd---17548360225.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/qtfg6niibbrliju5jmrf6h1bt5/87963049277.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a4a80378---dubeguziwasisewan.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21566ee838---5731442453.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e97c25f2---64037633391.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c2d1d667ff76fb722669ecc46e75ec2b/maxajobunusedaxinofu.pdfIn PDF document text
- http://rebeccafantarchitetto.it/userfiles/files/7795985498.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lkibe7df87sgfgk3sbh1lbl5s7/95084170437.pdfIn PDF document text
- http://capesociety.ca/uploads/files/11237760216.pdfIn PDF document text
- https://myphi.biz/nbloom/fckuploads/file/15541704403.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a7a6122e---golufenup.pdfIn PDF document text
- http://4seasonstours.in/userfiles/file/fobiladal.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4306ee2c8---lozoduzesukebefopuj.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hhihelhhmnf6rqdhin9tg53ha1/ponepelabimavewijo.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fe8ea5f6---vozedabivitede.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce622476a---vufaj.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5200bf9cbf6d8cfddbcbbad9b362b4be/3147475389.pdfIn PDF document text
- https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/9c8efe5090b13f409752bd98d56109a3/bumozazewaz.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0bb22a80---tabib.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ivfk74ff1ickki2r9eeubk2ab3/30650128326.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098860e2d7ed---75409434707.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_off0000d313.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD313	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB2A	10856 bytes
SHA-256: `df8b37d50fa6332ea2063a95f05599f9eeb6eda65fb69b5a7f9720c68ac10de6`
`font_02_sfnt_off000103d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103D5	15276 bytes
SHA-256: `159ad51a05c052c8a288d4bc882afdc4c62216fc3ff13321e20e1575eb54cfe8`

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