PDF malware analysis — malicious · f37038f6858952a1

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 11:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4b2a74eab0f39a423bdb3f2cf6d06eb0 SHA-1: 6c1ccbadac3d7dbf9ea9e731765812d5bdfeb3cb SHA-256: f37038f6858952a17440e350834fd752f2203d72996621c86b1c1ac5fa957cfb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of multiple external URIs and a link farm heuristic points to a social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://www.sport-konyv.hu/userfiles/file/93856971370.pdf In PDF document text
- http://nikkenj.com/userfiles/file/sowizunim.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de26bfc0d13---raxikinuputotij.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f90d80de2---26732501766.pdfIn PDF document text
- https://scavilecis.it/userfiles/file/fadorawaxezinagerun.pdfIn PDF document text
- http://0048.pl/48files/file/wubikadatulekubewibilaw.pdfIn PDF document text
- http://first-group.kr/ckupload/files/84612567753.pdfIn PDF document text
- http://lateonsettay-sachs.org/userfiles/file/ruvufag.pdfIn PDF document text
- https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/d3f36nrc2bdl5anrf4cmn045pd/9919907194.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7f5cde3a---tenukitibefofolakudi.pdfIn PDF document text
- https://stijsr.com/userfiles/file/womomenumisefimo.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd73ecec69c---mupiwufinuvobolajiwer.pdfIn PDF document text
- https://ms01bet.net/contents/files/nozigokuwevisase.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/90740493285.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8444893c5---67931711704.pdfIn PDF document text
- http://fsnmmaterials.com/UPFILE/userfiles/files/65584711558.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e06b453f8---2849472311.pdfIn PDF document text
- http://chuaphucluong.com/uploads/image/files/17583072520.pdfIn PDF document text
- http://ipceurope.eu/assets/file/6595602199.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9484c2431731a72bf09be18a35021bb9/dewujabaxuwebuwibu.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a364a0203dc29836816c596b8abfb238/5301325738.pdfIn PDF document text
- http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3c16bbc4---80517368337.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b370cc83480---tanupagutul.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c48979bdf41---51775082048.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a7184056ea07ba4eab6f50f009e6ab5/waxofidojenumodesiruzebu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manualidades+con+papel+de+diario+canastasPDF 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_off0000de61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f673.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF673	18496 bytes
SHA-256: `242a313051f2408a0d7da8666d1f82179018676d984912eac47f60e38e20113e`
`font_02_sfnt_off0001255f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1255F	10600 bytes
SHA-256: `313be96cbd713e97e3126b210f6c22d2b35426ce27a1e22ddff54da93613eb93`

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