PDF malware analysis — malicious · cbfad88b55688813

MALICIOUS

PDF

97.9 KB Created: 2021-09-21 01:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ff94ca3f7683d6c4a58aeffd69ee487a SHA-1: b9faf7a1fc4721ecefed676691666589777051ae SHA-256: cbfad88b556888131824479171e7b271f527ceeb38d62bc572df1265b729e956

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary URL suggests a lure for downloading potentially unwanted software or engaging in phishing activities.

Machine Learning

Nyx PDF Classifier malicious score 0.9569

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://inwebjor.ru/uplcv?utm_term=fifa+mobile+21+mod+apk+unlimited+money PDF link annotation
- http://styrexon.cz/userfiles/file/87648276234.pdfIn PDF document text
- http://zopos.zohukum.com/ckfinder/userfiles/files/verozuxoposejureminuve.pdfIn PDF document text
- http://2ds-creations.fr/userfiles/file/66419038650.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02792ef94---28368311110.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/7563539704.pdfIn PDF document text
- http://studiodugnani.it/userfiles/files/7532076940.pdfIn PDF document text
- http://www.frank-diagn.hu/userfiles/files/45716984684.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb5d13523---96027136792.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/db4b4ed3e19b94b757768be4d175203f/munevelexavufawonusixunuf.pdfIn PDF document text
- https://resicolor.com/upload/files/kosabudujexagijin.pdfIn PDF document text
- https://kalashad.com/userfiles/file/600390561.pdfIn PDF document text
- https://polnische-zaune.de/userfiles/file/vudakovaboxenebijure.pdfIn PDF document text
- http://fmdscu.net/userfiles/file/54917096243.pdfIn PDF document text
- http://autosvilar.com/uploads/ckfinder/files/xanosul.pdfIn PDF document text
- https://aczv.fr/userfiles/file/36099020007.pdfIn PDF document text
- http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/37251372774.pdfIn PDF document text
- https://euforbiabulgaria.gbinvest.net/uploads/pages/files/48471395188.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/sufug.pdfIn PDF document text
- https://dichvumoinoi.com/ckfinder/userfiles/files/78737950644.pdfIn PDF document text
- http://minipit.com/data/files/14044841717.pdfIn PDF document text
- https://www.almuhja.com/ckfinder/userfiles/files/tasaxaxixalufofadidi.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f861693f3---xivum.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/766d2f580e186ba0671fc1a2beb66d82/befowodijad.pdfIn PDF document text
- http://jmk.kr/ckfinder/userfiles/files/rovowaveselu.pdfIn PDF document text
- http://vekosgroup.ru/userfiles/file/rujafozusipikavuxem.pdfIn PDF document text
- https://netiko.fr/img/Data/file/48701097247.pdfIn PDF document text
- https://woft-dining.com/webroot/editor-uploads/files/roxazumemiwawemaba.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6c1562358ada02fcd9766d2d0dbde4b7/17414782158.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC42	1868 bytes
SHA-256: `9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51`
`font_01_sfnt_off0000f4fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4FA	10988 bytes
SHA-256: `8da6bd531f830cbfa4c7cbbff0a4290a2ac72c6fbab0c532df93f69618d61943`
`font_02_sfnt_off00010e4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E4F	23596 bytes
SHA-256: `21744551e35ec48de6b5dbb3ef046b2835f9d6a2653d0b37821b80442597b861`
`font_03_sfnt_off000149f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x149F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off0001620a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1620A	16232 bytes
SHA-256: `2192ef8c8cb950dd4806fffd7b4259b8447906622237b2b9c155e303af8138ee`

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