PDF malware analysis — malicious · dbb7ab31c030193b

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 13:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 841e518071bc20491d52142250008cbe SHA-1: e51da6538dcaa3c78b415ab54d0e2d4fa1ff396b SHA-256: dbb7ab31c030193b6345d64598047588dfa005919b0a0d768c7419bcd50981d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=piano+apk+free+download PDF link annotation
- https://mimpishiodua.com/contents/files/durawaremovuxawotu.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cf52d1c6fcb0590e67994f5336392879/90561494570.pdfIn PDF document text
- http://studioschicchi.eu/userfiles/files/17417306189.pdfIn PDF document text
- http://popnmusic.fr/userfiles/file/93014714752.pdfIn PDF document text
- https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/soranurilexezesuk.pdfIn PDF document text
- https://glamweddingdesign.com/userfiles/file/67593673061.pdfIn PDF document text
- http://engcaphone.com/_UploadFile/Images/file/95015264099.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9f8c3771ef8e1e2789f7ead82ee4b6f3/tilezal.pdfIn PDF document text
- http://www.sczct.com/up_files/file/30288567154.pdfIn PDF document text
- http://hnfhdc.com/UpLoadFile/2021091813122890859.pdfIn PDF document text
- http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bekoraradog.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef39dcc876---mulumuxoki.pdfIn PDF document text
- https://lensprovn.com/ckfinder/userfiles/files/28150010075.pdfIn PDF document text
- http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40551873760.pdfIn PDF document text
- https://pre-www.bridge-college.com/uploaded/ckeditor/files/34973582024.pdfIn PDF document text
- http://wintec-samu.hu/uploads/files/zopozadusafugasipixi.pdfIn PDF document text
- http://westernstudioservice.com/admin/userfiles/file/66009784701.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/54769839520.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef70097b1---98524331891.pdfIn PDF document text
- http://winterwonderlandzundert.nl/uploadimages/files/pazaru.pdfIn PDF document text
- http://www.udelimpa.es/ckfinder/userfiles/files/38858095036.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/wowonuvidit.pdfIn PDF document text
- https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/72148690108.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/79323659627.pdfIn PDF document text
- http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.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_off0000df4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f761.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF761	18336 bytes
SHA-256: `7905a1be74cec431a705795894c69eca0da9f3348331299d86ce23ada89236ef`
`font_02_sfnt_off00012730.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12730	10404 bytes
SHA-256: `6ec3bb80895d918d7d9af04345037589091280b8da2ac128c68677a028b9015e`

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