PDF malware analysis — malicious · 83fdb2d4061dcf09

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d695df1e89b5ce6eb07d91010eda61f7 SHA-1: 87d155f83d93283d9f4d801190de75d72a800b46 SHA-256: 83fdb2d4061dcf0917dfdeac772033e08f458bbe1d1fa4d40e2ec768694fa0c8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm patterns indicates an attempt to direct users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=wasp+sting+swelling+and+itching PDF link annotation
- http://dgjinhak.kr/DATA/upload/files/202106081045548633.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee951c57bd---rufozor.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3631ac14b7d66b095821ed4b986f0c67/41530408472.pdfIn PDF document text
- https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/40e6d1c47f0b49152730b9b7a21e4d47/lupiren.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bd764b1a6009fd6ecfbaec008a9a8a7a/33795264046.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n39602nia1oo0r2tgcbit2qfhv/12137418484.pdfIn PDF document text
- http://rsst77.ru/upload/files/96968666256.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62456011c4---72009482836.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5tcbvbqh4c6l0ga9as77d0ra5g/jenemaseros.pdfIn PDF document text
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bd19a60f48102bce18ca719dbbcf7de5/18345359000.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5eafb84d2a569752bc6fd4a977ef5419/vejumofanazumuwezano.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f771b7bbf7---sunusevur.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/fukuxopamazomigojib.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae77b8356---91740362876.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kdvp61eajdi2utlpv24cdtgjc3/zigebam.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a13f4858a7657b819c164783ef10cc45/joxabona.pdfIn PDF document text
- http://naucseto.cz/storage/52500740938.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/86197029e41c2d513b4a73af6a53b454/dojugurisikoxuba.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0378c7ca5883d9ce856add3a408dbe/wovunezen.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50307c75258453a9df0b3ff0176c803c/49527947706.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/innrk24096351opdruic37qq70/rofelokurasijawewizu.pdfIn PDF document text
- https://taiwancy.com/app/webroot/userfiles/files/puruluka.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4a713d86119ba4fc1e01a97543ff173e/dutuvetegivizadafifabaxil.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9ca75c32---64278259402.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6d0009b2ab0b0b5fffbfe35ab0c52184/17718143116.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2564746fe1f7a7dc48dfefa7f2ce86a6/ziterobed.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_off0000e96e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE96E	10652 bytes
SHA-256: `0d690db12302daf6ec2dbf7cff17ecda2c90eb94acb9c53158b686f228ed2995`
`font_01_sfnt_off00010197.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10197	17208 bytes
SHA-256: `9561e2737f4c4aa26983ac3fc7998ad1e4f5eab24d630bbe83cfa93258210a1d`
`font_02_sfnt_off00012e49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E49	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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