PDF malware analysis — malicious · dab059c75a997940

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9efff54b9415b32d61b05781ad517d7c SHA-1: 64e51cf97232d4884fb7548b0ac7d7f6631185e5 SHA-256: dab059c75a997940d832e71c0d70bc8bcdaf23ab1e31da28d0a3078b1e953e15

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many hosted on WordPress installations, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613817611660d---56579792525.pdf In PDF document text
- https://proartgaleria.hu/files/files/21121738912.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613170d8c2fa5---60546866324.pdfIn PDF document text
- https://webmedcentralplus.com/userfiles/file/88389820690.pdfIn PDF document text
- https://quizai.com/uploads/files/63060730928.pdfIn PDF document text
- http://nenkin-t.com/upload_img/ck/files/safetuki.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/xegofimugulumerejojupidan.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3612bead4956bef607c13335e372dcac/23210032821.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/36102575582.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/55s0226ib0hd9vrt2chli01dhl/wusaguvot.pdfIn PDF document text
- https://tadimtursu.com/image/files/21190705214.pdfIn PDF document text
- http://clairvoyantinfotech.com/demo/images/74569928783.pdfIn PDF document text
- https://perfumes.dropship-tracking.com/userfiles/files/6746928314.pdfIn PDF document text
- http://zzzwchem.com/upload/files/pubibofade.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee219ea09---1108852561.pdfIn PDF document text
- http://learnersdigest.org/userfiles/file/13946894223.pdfIn PDF document text
- http://balie.overeembv-profielen.nl/upload/files/85858713062.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/94969596925.pdfIn PDF document text
- http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80280049863.pdfIn PDF document text
- http://ccsl.asia/files/39594537919.pdfIn PDF document text
- https://goodline.by/userfiles/file/43308871446.pdfIn PDF document text
- http://nbc.ua/design/pic/file/73331345419.pdfIn PDF document text
- http://prplus4u.com/ckupload/files/mowibiba.pdfIn PDF document text
- https://studybrilliant.online/app/webroot/img/userfiles/file/vugibikewumonaga.pdfIn PDF document text
- http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bibotunevuwub.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+transfer+files+from+pc+to+iphone+via+bluetoothPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off00013a19.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x13A19	18956 bytes
SHA-256: `2a50afd1bd6ef5b459bb4cf91dc52b7908119528320d32c0f319a3427228e774`
`font_00_sfnt_off0000db98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB98	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3AA	17368 bytes
SHA-256: `2347b8106c08d3618c1367e98c312b91f8fae53d6c64fe328148c371d9d11e9e`
`font_02_sfnt_off0001208c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1208C	11128 bytes
SHA-256: `2ea5a14bc4e0eaa795b0e1cfb2fa711a0dfaa9c599a5218afcb86b80173cc37e`

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