PDF malware analysis — malicious · 0418b16d4bffa308

MALICIOUS

PDF

95.3 KB Created: 2021-07-15 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d7c71d24459e5787cf32e88f08681a58 SHA-1: 5f1edbdfeaee0da79d4c81ffe78f38bccb0bf959 SHA-256: 0418b16d4bffa3080ed9523a76682d67c209102de4b2fadcd21e4eb425f5a66b

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. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4o7s4ndnk5pg96gj7tljsjups1/2870932907.pdf In PDF document text
- http://griswoldremgmt.com/uploads/files/81096575944.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e334979c8d5862d91620a04d2bd80f84/nawovijosodigipiwob.pdfIn PDF document text
- http://crediramasrl.it/public/file/sonamefeludir.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bc0505d0---keberuvenematirazosesaxok.pdfIn PDF document text
- http://meechoktoolmart.com/user_img/files/64310427382.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16098943064a44---67554611536.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a7c5cb90---10630634981.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/257b39e1816884013db0323074f9a6dd/xewedawolaxuvogikukos.pdfIn PDF document text
- http://heyumpnd.com/userfiles/file///bipiwabasojesezomas.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6d4bca818c86196fd078b398f616b98c/75411650810.pdfIn PDF document text
- http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/levolanewosuziwuwigot.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8f3eef47---62984512807.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/h4efb4jcmblsb2kvl0cpi9th65/53632189799.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609517b8df1b8---muxubeloj.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088348e95eb9---47675935388.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/56b96aa76ede90cad9400e1d3268ff2b/25709444765.pdfIn PDF document text
- http://imcborivali.org/userfiles/file/75244846845.pdfIn PDF document text
- http://tano-cable.com/d/files/fezumirokubonowebozapa.pdfIn PDF document text
- http://nhakhoasaigonkimcuong.com/uploads/images/files/1861203335.pdfIn PDF document text
- http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/7236863947.pdfIn PDF document text
- https://aspaeng.com/files/image/files/37060416109.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce81ae76d9---bozag.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=number+of+valence+electrons+brominePDF 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
`font_00_sfnt_off0000f951.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF951	10780 bytes
SHA-256: `3fec5a5b3155f60a21f9202b88e10c3cfa2f7c95721dc279d1e23ddbd559bb44`
`font_01_sfnt_off00011225.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11225	18112 bytes
SHA-256: `20768882ea3f90a9b9d6896abf55468dd8407991587ddeea2c29434caa4fe39f`
`font_02_sfnt_off0001419c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1419C	16168 bytes
SHA-256: `1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68`
`font_03_sfnt_off00015738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15738	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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