PDF malware analysis — malicious · 41941ee42b7f4a05

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 10:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b91b268d7806f432de8437e58399786c SHA-1: 49679e0128733c0e17004dd22428a07293a4b38a SHA-256: 41941ee42b7f4a05fdd35309d3153e2a92121628c107255992298db92ee7bab6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, with high confidence. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites. These links are likely intended to lead users to phishing pages or download further malicious content, aligning with the characteristics of a malicious PDF used for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=pariser+platz+berlin+pdf PDF link annotation
- http://ippinnudon.com/uploads/files/69921342700.pdfIn PDF document text
- http://pitchdecor-construction.com/user_img/files/12004907977.pdfIn PDF document text
- https://bczenekar.hu/files/file/padebipaba.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5af422ae---36798563584.pdfIn PDF document text
- https://heritagecambodiatravel.com/userfiles/file/tidumaxidawogi.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ef12779afd39556c962e843226a0935/xiziroxevudilamewugudokor.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/wifixarodolelomivulojot.pdfIn PDF document text
- https://hunglivet.com/uploads/files/202108210201326183.pdfIn PDF document text
- http://vonschickenconcord.com/uploads/files/41860555223.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4b9aab25---84870645298.pdfIn PDF document text
- http://skupka23.ru/upload/m/64379717112.pdfIn PDF document text
- http://onellenorzes.com/uploads/files/85102396025.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084685f2757a---wusigosemaxetuxiviju.pdfIn PDF document text
- http://www.ssc-ras.ru/ckfinder/userfiles/files/mudelagivelimagirut.pdfIn PDF document text
- http://arcstema.com/userfiles/files/pigidilopobanimilurun.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/jekugi.pdfIn PDF document text
- http://restauraceeverest.cz/userfiles/file/fuvezenofolupis.pdfIn PDF document text
- http://faurau.com/luodan/images/userfiles/file/88951984514.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa73dac03b---21549585286.pdfIn PDF document text
- http://hkalc.com/userfiles/39632732193.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/35984487104.pdfIn PDF document text
- https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e649b51f489f015b0c7c4689f447a079/boxejijisenemoxukilomud.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c1d2d9ca---kuvomuwapig.pdfIn PDF document text
- http://tehnicgaz.eu/files/file/29068679601.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c87b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC87B	10572 bytes
SHA-256: `0fdef82e3cf30dd6d77af2d3d55375144800f098cc38489151665031af6ba5cf`
`font_01_sfnt_off0000e07b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE07B	18044 bytes
SHA-256: `cb8cd1ffd2169dee9f19f357e1b2847eae1e7b7a1629d555ad2145c01b577e10`
`font_02_sfnt_off00010e3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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