PDF malware analysis — malicious · 255fd7d7caf6d7b8

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 13:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: fbd37444cc7546e8a3f333269118735b SHA-1: f6f6b3ff25f9515c094f008a5bf6213d16ccd952 SHA-256: 255fd7d7caf6d7b82512d3ebab692fb8bbc9ca5363719ab24adaa6c46ab7456a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure points to a link farm attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee41192f48---zorowinokebaba.pdf In PDF document text
- http://10glazsikeyrosa.ru/file/fiwesoj.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/okpogfbn314d3tpf1e6igitdfl/37823651832.pdfIn PDF document text
- https://mariellatriolo.it/public/file/rosamiwegajerogipugez.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f3ad7b5efc103c750d632c578d94450/3010317563.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecdb3afe3---72463738827.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053a6d5ed1---32155907619.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8df14ed7---kugofe.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160917e4674be7---bobodalo.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db65ec1616---sitosifiwijuxuleloro.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b377998a36---3042995809.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3d21e71f565e25b3f7b0fc6f9f1d0bc0/43107001908.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/rurolonerinutovavuvan.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092009185e01---65633578082.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3a71b13---8472294738.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5ccc5b2469afbe8623abef8eb583b31c/46395432950.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/04f8219c72a7b5f9f589bce851f14e05/xukisepuwevusolugamoxi.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/h7c9484h69vvsel4f5iou5ke54/wosidemadewexar.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ad61eaee04073a0d63ae7bcc508b18b3/39604812512.pdfIn PDF document text
- http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/jebavazugefifigopedepuger.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1c97b165---61425763209.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/gcm2fmaq5dd1v2h9892uacb8q6/taxeborajumipugimobez.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5771d58d7---rewubixemomatipetaxiwap.pdfIn PDF document text
- https://birudongker.com/contents//files/52921261875.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0629a74d---87884907801.pdfIn PDF document text
- http://birzebbugastpetersfc.com/files/file/fudabelovapurisitemijap.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/975rc0tps6hcq28mtmqg2jmoe6/21503149222.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/fapuguzifagarusikomudixut.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=catwoman+dc+animatedPDF 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_off000108d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D6	17332 bytes
SHA-256: `58508406c9012e54829396356118ab878ee38279f6e67c1aecd353bf0e7b548c`
`font_01_sfnt_off0001364b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1364B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014e62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E62	10332 bytes
SHA-256: `13ca9c69f6db063a3a2477b0137b164bf555e38cf92d133990483285c06e5b67`

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