PDF malware analysis — malicious · 38181d6fc5ee3635

MALICIOUS

PDF

89.4 KB Created: 2021-08-05 00:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 34a803f9aa5a634f81e1dbd78d79d8b9 SHA-1: c6ee3477cdd6a1a86aac61f506548df8af26d829 SHA-256: 38181d6fc5ee3635cf01eb11e61f55f990b7edeae6355b835c07ed6bf287b6b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

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://nomylo.ru/uplcv?utm_term=teoria+del+comportamiento+abraham+maslow+pdf PDF link annotation
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/758opk8lsojcofn6i2pp0fkeb6/watuvabolomakagajug.pdfIn PDF document text
- http://huerural.com/uploads/image/files/5694164268.pdfIn PDF document text
- https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
- https://towa-aaa.jp/userfiles/file/kakif.pdfIn PDF document text
- https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad6a86e8a---45252067783.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160833382a58e1---lototigifeno.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe51254d4---47197188346.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pksp39mfkihntgh68nc68dk2oe/67275976888.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5687ebaf77---85417710203.pdfIn PDF document text
- http://southport1969.com/clients/861680/File/vepoxonasub.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/37c5b7088774707ce798690fb553c3fd/89259773127.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e1066151095c11544bae218454c582d4/88246325212.pdfIn PDF document text
- https://kocarbon.vn/luutru/files/84978977986.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/369afef5ccd0764db432d341ddfe430a/50379717534.pdfIn PDF document text
- http://huichem.com/ckfinder/userfiles/files/72236441481.pdfIn PDF document text
- https://griby.biz/ckfinder/userfiles/files/22156784177.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/599515eefb2803448a7639f77776f9b7/suxanazufelafiniserereve.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/56294296375.pdfIn PDF document text
- http://www.sictombbi.fr/ckfinder/userfiles/files/kinokusi.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/720ae9a9d2ddab57f43908bb6e7cc992/593606575.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltthf2fee9pltkiv5mts8seb09/tumejufuvesuxuzefi.pdfIn PDF document text
- https://dunaweb.co/bg_image/files/1701396102.pdfIn PDF document text
- https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/9ee56fb34a8a259e16413bb4fecc60de/47961101844.pdfIn PDF document text
- http://yummyschool.com/_UploadFile/Images/file/83119970603.pdfIn PDF document text
- https://gamma-electronics-eg.com/userfiles/files/kuzuloba.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874b5959b45---lemofo.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_off0000f618.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF618	11076 bytes
SHA-256: `9a085558ef74c6ce863fcda3760a01561dbee0c5e17848634279508c9d0ed3a2`
`font_01_sfnt_off00010f7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F7F	17548 bytes
SHA-256: `f02ada0a13ba20f9cec3b25cab9f50918707b11240cace9355036f29ea08d20d`
`font_02_sfnt_off00013c4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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