PDF malware analysis — malicious · a8d232805a0264e0

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f2f7ad7f087d45c67e239ba027d6b148 SHA-1: 6687cb2e55f878178318d3352a75272bfd5be64e SHA-256: a8d232805a0264e0483dad309947c140bb2dc831411450d196a4e61fc8375267

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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 https://dadrarad.ro/userfiles/file/31800374341.pdf In PDF document text
- https://inprovitcentroamerica.com/ckfinder/userfiles/files/17958433867.pdfIn PDF document text
- https://appvid.eus/userfiles/files/jinovasuwanasat.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/rofagumajuvofemet.pdfIn PDF document text
- https://galaxytraining.examinationonline.com/files/bedovumaviwalidiped.pdfIn PDF document text
- https://www.akilciilacdernegi.com/ckfinder/userfiles/files/lexajusuvexaluvukuwozad.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d294dbc47b---jawubi.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df031aa25---30798741473.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/79069010077.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bdc75a7560e46c7acb7ddf0c951fddcb/sezidexuvafakulajoxadulo.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdfIn PDF document text
- http://interwork.sk/userfiles/file/jixuno.pdfIn PDF document text
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/tukasiguzasijujirup.pdfIn PDF document text
- https://svenjakretschmer.com/ckfinder/userfiles/files/41290227439.pdfIn PDF document text
- http://falconfam.com/ckfinder/userfiles/files/tulafutinanebu.pdfIn PDF document text
- http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/68185823649.pdfIn PDF document text
- https://nakatarikaszel.pl/app/webroot/userfiles/file/55712523795.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/446b24f601c6d125df0e54e0c7e6aa37/76673367887.pdfIn PDF document text
- http://softtox.pl/new/userfiles/file/bobalofox.pdfIn PDF document text
- https://pcetravel.com/files/file/44458927789.pdfIn PDF document text
- http://dgkno.cn/upload/3907946218.pdfIn PDF document text
- http://ediljolli.com/userfiles/files/patijenomuxikexu.pdfIn PDF document text
- https://thefertilizergranulators.com/d/files/jijuxepukurivep.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/34330517740.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/95409006366.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chal+jivi+laiye+full+movie+watch+online+freePDF 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_off0000cb31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e343.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE343	17424 bytes
SHA-256: `50af2208aa7044fa6527afff0f2637fd677d96474e12eb7cab68100a26cbbfe4`
`font_02_sfnt_off00011043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11043	10960 bytes
SHA-256: `ca8ed179c8aa4fd02b0fc3bf7ee15e3691ead10167a0a3f0eede3b038764d961`

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