PDF malware analysis — malicious · 49d5cb836954f506

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 10:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6e87d7bf25c4e10f9dab41d91746f313 SHA-1: 901578432aa1bf1cae7d79656164a3fe05e1b9ac SHA-256: 49d5cb836954f506b0ac0e82e46d5db35060b9c654d2178798c2dd488bb93b68

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable domains, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially untrusted hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://saltokisport.com/uploads/files/malowipeni.pdf In PDF document text
- https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609899b254af6---93835034858.pdfIn PDF document text
- http://billsky.ee/files/file/92414462907.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ol5b4ndunh4l698b032v9tpat3/22142304441.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161367b3eaa17b---88452188347.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23c9e329e---rafikutozolefizafejapofas.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/736o8o1k8jt17rtkr2ceggmvcc/vuded.pdfIn PDF document text
- http://denkobarbell.com/_upload/files/rabidojur.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8b514c80183e39d2ba9d77c636ff45dc/70962886142.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d994742a8---fabuzolinug.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d72e387cfa2aa086d8328d261b730354/31945525044.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608400eb43f2e---wadizofitina.pdfIn PDF document text
- http://club-integra.ru/userfiles/file/29242828186.pdfIn PDF document text
- http://bobas24.pl/Upload/file/lezixurobi.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/dupajatezoziz.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2361eba12099a1dd351c65bd1acf00ac/56638412258.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c04cd804---75358585975.pdfIn PDF document text
- http://myphamlulanjina.com/upload/files/37465022105.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8pc2idfg00qlnt7h9rlvr1aqcb/zuxilaxiwesunuratanogabe.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ipltk2erascmtvisvod3alsnkj/pudovivalodutezivivesaw.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0obigr23a8pat2qi03p7emgpuf/89164887228.pdfIn PDF document text
- http://srtprogetti.eu/userfiles/files/66295689028.pdfIn PDF document text
- https://uppersanduskyrotary.com/cms/files/File/52158784300.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c608bf0ec4c---fukonefa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=agenda+web+present+continuous+pdfPDF 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_off0000c065.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC065	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d877.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD877	15448 bytes
SHA-256: `3c1ec3e19440bf4a44546e6c0cce4362ec4043187e9163ff66616cbd0e33ace3`
`font_02_sfnt_off0000ff6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF6D	11056 bytes
SHA-256: `00d40581c1ea1e624facbe4f1710ed13431ab4e366de2b9e406a732a377e5feb`

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