PDF malware analysis — malicious · 5649f836d3e54866

MALICIOUS

PDF

89.9 KB Created: 2021-08-26 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 5c5185abd411e4126f88f2c220a32adf SHA-1: 33361f06ae4fad3ea0fd2fb60953994b9ba65667 SHA-256: 5649f836d3e54866319dcc2af372755712374df25bec42f04b127f4541c10749

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards a spearphishing attachment, potentially leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=use+for+phosphorus PDF link annotation
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/116292343eb135c32a2b55803febd32a/14501207775.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4cmqm6bn5t3s8os742t04v83k6/fojinebinidulesojo.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v2fplfja2j8tjc1r8uoibbtvcc/83021389730.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b040907c82b---lotidisirim.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/wuzafolaxipabavit.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qhmoits48r530tqdv2nsp5oeb2/sibamurin.pdfIn PDF document text
- http://alpha-cp.com/userfiles/file/94527780764.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da340dc1fc---17982755364.pdfIn PDF document text
- http://midel.me/userfiles/file/vimuxaf.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebfdd1fb9---pegusufulapogufupujeseviw.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c971875c6d---83899271240.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
- http://samurairamenbar.com/uploads/files/lomavopekexukuxon.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c4108a27---66323919334.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/90410783446.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a2117a---xidilawonav.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5da72e8bd---78324508852.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d29d592f---18071164800.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qqerjjlco0gu1h9iassvmke5n7/bumabu.pdfIn PDF document text
- https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a1305ebb90ca8b5f511e952ac188449b/dadasomesekege.pdfIn PDF document text
- http://dajuicebarus.com/uploads/files/juxas.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a168c45d3eb---18735529463.pdfIn PDF document text
- https://nicklason.se/ckfinder/userfiles/files/231301749.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off00012448.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12448	17624 bytes
SHA-256: `80efcc643d4af4ed339c954f95d7b5a12947786be87ad37cdde422974b6e9630`
`font_00_sfnt_off0000e26f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE26F	16736 bytes
SHA-256: `e1189516142cdad3788941049679420d7fdf1aaa9db73788fe427e9c58f70c21`
`font_01_sfnt_off00010dc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC4	10060 bytes
SHA-256: `ae0265990f6a9c02164bbd711c5fe3e0f6f09ad3a457c375a061a976e12cdcb6`
`font_03_sfnt_off00013f7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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