PDF malware analysis — malicious · 704adf28d48d4f47

MALICIOUS

PDF

94.6 KB Created: 2021-07-07 19:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 520784a8ca7da8f72b438eb9842138b6 SHA-1: 636602ebaf7458c01dceda2f89b4679734c8e87c SHA-256: 704adf28d48d4f479f03614b6155bea557c1e1f28ebcb45bd07444d1b7ed504b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://fotofolliasanlazzaro.it/userfiles/files/deraluxasijad.pdf In PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8c173649dcdc0da5d7865a2a118b2e95/73958540460.pdfIn PDF document text
- http://gelateriacool.it/userfiles/files/xonujitizotiwadulosi.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913c0845098---rozudememozudupijifuxe.pdfIn PDF document text
- http://dermalab.pl/userfiles/file/palufeliselimolidor.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/gewamekoxuregamavunejunuw.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e5cb677e---jijugiwipipawut.pdfIn PDF document text
- http://ac-kenigsberg.ru/files/file/xepinipuguworazo.pdfIn PDF document text
- https://recapress.com/ckfinder/userfiles/files/8122872613.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc30cde44---wafijudutaweraresifojeto.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace78eab9f4---80072733155.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6esabho0i2o5hu557al4ujpcqt/93324878833.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf946255c---kogebibivarawuvupodu.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a1nl46f70mdmtgrt052rhu6uo3/65994370752.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7991a705---gimunotutuvajemu.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4373ce7e9d631ece49a752c1de800a96/90112412421.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9f298b3a972c0d30fb8fc10104478b80/425500457.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a083bdfaf---gozotikuwuxutetawi.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/67730017336.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d31afd58d6d1253cf159d11f13eb3b68/gisakipunixalosoj.pdfIn PDF document text
- http://timeyear-v.com/userfiles/file/sijaxawidi.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae7007ebe3---sijepijanujuwemilaxata.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2eac7423---3765915379.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b3fb5f22---7167766501.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=six+cubits+and+a+spanPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ed52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED52	17628 bytes
SHA-256: `622fc00f59ed4d9e42b5144ea9f522db31003f267f13eb571f44e2a7a4512935`
`font_01_sfnt_off00010851.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10851	20032 bytes
SHA-256: `49511744e3fedb10704cde0146f0a87da8750723fca52cbb4bb90bf688d7f988`
`font_02_sfnt_off00013cbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000154d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x154D6	10528 bytes
SHA-256: `dd271cf4875962420e5c23c613f406325c5017d0f36b42c8dc34f8d99f1da18b`

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