PDF malware analysis — malicious · 42244abb1b695854

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 23:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: af6883fba2e573bfddea6a95a0886835 SHA-1: 45a2342ea8bf4a708b7a2e37348340b0e7c02123 SHA-256: 42244abb1b6958548b517aaf5013e64b381b9fb60a36bcdc1e6266ee126819f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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://opuspointpartners.com/ckfinder/userfiles/files/rusegijasisirigepeluj.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138e4ead7---kabinerofagajufotikapiv.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413e169a141---lemokowefimi.pdfIn PDF document text
- http://hicoweld.com/shop/fck_file/file/gujesibogonidalikokenof.pdfIn PDF document text
- http://centroolosprato.it/userfiles/files/fomeneta.pdfIn PDF document text
- https://sluganarodu.org/userfiles/files/96863917288.pdfIn PDF document text
- https://ideylia.fr/uploads/file/41856522035.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613807cece857---8132180675.pdfIn PDF document text
- http://hotstamping.pl/files/file/papotaxizivefifusedu.pdfIn PDF document text
- http://uhorder.com/upload/files/jalumemotogu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0719d4400---vusaki.pdfIn PDF document text
- http://terremeraude.com/userfiles/file/8209306342.pdfIn PDF document text
- http://szigmetal.hu/editor_up/93833478063.pdfIn PDF document text
- http://amicissiapiemonteisa.it/userfiles/files/pivuwofelifasokifibor.pdfIn PDF document text
- https://fiscalonline.eu/app/webroot/files/userfiles/files/4679176068.pdfIn PDF document text
- http://prabashproperties.com/ckfinder/userfiles/files/16613159378.pdfIn PDF document text
- https://kapokcmassage.com/uploads/files/202109032056143947.pdfIn PDF document text
- https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/xalefiwimepametumum.pdfIn PDF document text
- https://inprovituruguay.com/ckfinder/userfiles/files/91622542620.pdfIn PDF document text
- https://resortweeks.pro/userfiles/file/dugajapafasivolizomino.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdb530eff---99220789089.pdfIn PDF document text
- http://zvezda-rostov.ru/ckfinder/userfiles/files/54425849861.pdfIn PDF document text
- http://brickchamber.com/ckfinder/userfiles/files/81601272742.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=horror+games+free+online+unblockedPDF 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_off0000ce18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE18	17352 bytes
SHA-256: `3bba5e435a4542c7e24e3a3fbf00e68034ec3fd43d5ccf883b8e2fdd008201da`
`font_01_sfnt_off0000fb3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB3F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011356.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11356	11044 bytes
SHA-256: `5231094d08f640716969b08c6ecb13e1a4b5424ae1470e2daecec8450695478a`

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