PDF malware analysis — malicious · 5af470fc68fba560

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 00:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 83c35cbd4b7f45f5166a165a99d80601 SHA-1: f414f7b280cc4b3640d867b78c96e5ad20d3e2a1 SHA-256: 5af470fc68fba5604e51904de04a29178a0c5c87b30ec42fa62e0eb3efce3d9f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cructi.ru/uplcv?utm_term=fruits+with+most+fiber+content PDF link annotation
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d92459ad---vawekemasede.pdfIn PDF document text
- https://global-product.org/CKEdit/upload/files/sosakiguzagokurakevifufa.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/13f737330da274ef59d1007e0725dfcb/89097972784.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0777b7eba---1924925070.pdfIn PDF document text
- http://zhuoer.ltd/userfiles/file/vidoputifemafasojesovo.pdfIn PDF document text
- http://citadelcaralarms.com/userfiles/file/1581605905.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0ee3f0682---jukefivuxal.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf3a9c57c---vasilimilizisa.pdfIn PDF document text
- http://sieuthivatlieuhoanthien.com/upload/files/63781801784.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vfoufsv4dc6bqeqnoap5750huq/80350005818.pdfIn PDF document text
- https://karapinler.com/calisma2/files/uploads/6276475442.pdfIn PDF document text
- http://moreit.ch/productinfo/file/12641643278.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096218cb578b---fopodililewogabuduf.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3cc300d4---42804952273.pdfIn PDF document text
- https://saintarseny.ca/sites/saintarseny.ca/files/file/doxokokazevimetebajogebi.pdfIn PDF document text
- https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac494524---54519372282.pdfIn PDF document text
- http://mwflower.com/upimagesfile///21508790385.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4b28a846518bb7cfb5b05bbe61d323a0/sarufuru.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceee73f0ae---13803842874.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/62006598664.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0eb4f3b9---97885406089.pdfIn PDF document text
- http://gyobel.it/public/file/dujexobux.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084802f7779b---71260328391.pdfIn PDF document text
- https://chetanaus.org/bheru/uploadfiles/file/riwijibitopum.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e263fef2---8325642512.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/xukuvekorotudiboxabez.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_off0000c4d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4D1	10696 bytes
SHA-256: `13a6f6ed92b38974acce3f09fbe70a38244aee8c2b0e683d5ae5624a4176585b`
`font_01_sfnt_off0000dd3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3C	16544 bytes
SHA-256: `7e23e4a1862842cd9144614fae296eccf67e8508c668f818bb4279b0c8c59166`
`font_02_sfnt_off000107b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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