PDF malware analysis — malicious · a6a43f1483854830

MALICIOUS

PDF

95.1 KB Created: 2021-09-03 15:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d0f8fc0e5563b6369faa37cd540b755f SHA-1: 8d7cc9e7252f2877074fa825035cd57b5021cbfe SHA-256: a6a43f1483854830280faa3fb805dc2be631f1f319188da3852f4214676386f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a malicious intent related to URL redirection and potentially SEO abuse.

Machine Learning

Nyx PDF Classifier malicious score 0.9523

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://kraftyz.in/ckfinder/userfiles/files/vujetitalakekinapo.pdf In PDF document text
- https://prairieroseclothiers.com/FCKeditor/file/99567725201.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e6a5a8c980232e7341fd9f12810bfbb7/zugaxexeguzapamabosi.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cf463fa189c8655b251a977e4f47aae9/nuwegurolewumo.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e606dc2028657253f6a58a1f822db9f/jenurelebag.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc57d771593---62867800800.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372feec44---2760487247.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c6c8b30aaa6bd0de64c21c77ad318fef/vukubabubuse.pdfIn PDF document text
- http://maryalo.com/userData/board/file/84107180200.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad320d52807---kafuwutogupo.pdfIn PDF document text
- http://xhzhengli.com/upload/zeziwomewek.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd68ba8db---rorin.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fef045cb733---69847053002.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/69155820726.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3153e88d4d---81795147097.pdfIn PDF document text
- https://immobiliareincentro.it/allegati/file/51947349615.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/462ea6d1681a39ca6913479d96362240/lewatisifenapamunalakuj.pdfIn PDF document text
- https://10glazsikeyrosa.ru/file/60151003956.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/3564808368.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84ce9b398---34250426534.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161251f1f5e065---bususefezatow.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3b53b17a---38932687890.pdfIn PDF document text
- http://epmresearch.org/userfiles/files/8715759744.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c7dd972d27c801d35d41c99b6a588293/61013191415.pdfIn PDF document text
- https://vico-inmobiliaria.com/ckfinder/userfiles/files/sapedeg.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vl5vn06aiqdnsegbvi9n8o6t64/xefariju.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609260484f52f---mozupavezetatizidiwogu.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gejedisike.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ddc+controller+honeywell+pdfPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e19f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE19F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B6	10496 bytes
SHA-256: `afad1363850178e7520d89ac131011408ab246d5c50bf6dee7748225a64cdb95`
`font_02_sfnt_off0001118b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1118B	24204 bytes
SHA-256: `04c0578fbb76a6244bbbe5a2312dac68afbb2a5adec5bd47dc6908eb5d2f2cd3`
`font_03_sfnt_off00014d50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D50	1956 bytes
SHA-256: `767f3a4e7663472bdd3bb305a012e186aaec4ced2fdf34129d797c7929af7a87`
`font_04_sfnt_off00015656.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15656	16232 bytes
SHA-256: `af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124`

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