PDF malware analysis — malicious · 85379fa7876f86cf

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 10:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3959a10b0acb58855e7e0900190d3966 SHA-1: 88aaa71a7dbb1c58dcbb4017b62c791ba35dc6fd SHA-256: 85379fa7876f86cf8472fcdde5ac62d594fac6fd053c05a9f26574ed8eb1393d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers confirm its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's used as a lure, likely delivered via spearphishing, to lead users to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/dcdd2d50a55f01c7624fda4e75b464c8/26593653568.pdf In PDF document text
- http://ducnhua.com/upload/files/tifibamopejukususesike.pdfIn PDF document text
- https://ceccargiurgiu.ro/userfiles/file/18055733015.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613195930c6be---ginazusoteguwamikan.pdfIn PDF document text
- http://poliinc.com/upload/files/nufiwujetoz.pdfIn PDF document text
- https://acconpriti.com/ckfinder/userfiles/files/20308776417.pdfIn PDF document text
- http://veterinariacasettamattei.it/userfiles/files/totorek.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/19570029326.pdfIn PDF document text
- http://fotografiafrancescosomma.com/userfiles/files/39310129634.pdfIn PDF document text
- https://mmeasar.com/mmeasarfiles/file/5733117208.pdfIn PDF document text
- https://webrobogo.hu/kepek/35626162705.pdfIn PDF document text
- http://tzoetemondje.be/uploads/files/tilofek.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c8991f3c0bec7e84b27d6ecd4d9a2fa2/vebuvirigujofasemimu.pdfIn PDF document text
- https://aep-tc.com/cache/fck_files/file/21515201129.pdfIn PDF document text
- https://whatshoulditcostme.com/userfiles/file/2220142212.pdfIn PDF document text
- http://wawa757.com/uploads/files/57268563178.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b73dce25---keran.pdfIn PDF document text
- http://gruaszarate.com/ckfinder/userfiles/files/wizajekonetaf.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b566568b8e---xezufijejopizebuxavon.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc8486de8---11576680171.pdfIn PDF document text
- https://magiccat.pro/ckfinder/userfiles/files/vipupafusuvob.pdfIn PDF document text
- https://lideregitimpaketleri.com/calisma2/files/uploads/rakivujawujojisobafem.pdfIn PDF document text
- https://zhavezbozi.cz/data/file/lituvo.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///48034836987.pdfIn PDF document text
- https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zoridezitufiliber.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nova+settings+prime+apkPDF link annotation
- 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_off0000c5f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5F1	10684 bytes
SHA-256: `af3a4ca8ba9a517e1a337d63834f9651b3c87c36ed8964c4417236909a767561`
`font_01_sfnt_off0000de7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE7C	16644 bytes
SHA-256: `ff30c810a74532ea48be38923c4a2620677fe929981b08470a9528351cc1aff9`
`font_02_sfnt_off00010850.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10850	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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