PDF malware analysis — malicious · a97688ff86095038

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 20:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5a00d8dd384bebafe5543818d3b319cc SHA-1: b51fa773ab88bcea3b63c51a4be2e8f37c3ebe71 SHA-256: a97688ff860950389d43a643515b68f4de345031edd4ebeffbd9bef93cf30689

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, many of which appear to be part of a link farm hosted on disposable domains or compromised WordPress installations. These links likely serve as a lure for phishing attacks or to distribute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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=mechanical+properties+of+plastic+materials+pdf PDF link annotation
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8bff24690b2529be0084b0cb99e6da32/xusipofepakasapuwoleler.pdfIn PDF document text
- https://ivanda-commerce.hr/userfiles/file/34989382200.pdfIn PDF document text
- http://benrassam.com/uploads/files/66170617011.pdfIn PDF document text
- http://raylutickenterprises.com/userfiles/files/nawaw.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcdd6301ea---jutozimunipiraremevur.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vnrheq69eqo76uu6nf7vu3gjtc/perixarasare.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4ogi49l66n63jia7kfk5jsigm6/49410686915.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/58706375002.pdfIn PDF document text
- https://pfollowers.com/ci/userfiles/files/vawulole.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cd90827c0c974ed4f52cc141ebbdb074/gapozogowus.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/42548806023.pdfIn PDF document text
- http://thailaundry.com/imgUpload/files/misewalobesovado.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/53836342459.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161217f9140591---58770039983.pdfIn PDF document text
- http://nail-free.com/ckfinder/userfiles/files/lurobimodak.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/17455828507.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dafisidikufuzabowetanefa.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9fc6c480cabf4beed1016a8af79bca36/gozuwilema.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a589a08eeb2---pikumog.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/860b839074bdd2fd90683ee64d5b850a/ruviwasevovinelimadusub.pdfIn PDF document text
- http://royalgoodviewresort.com/Uploads/file/kabajiponumafixorulaj.pdfIn PDF document text
- http://goref.ru/files/file/pulutabetowuj.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f3099d897f7---nibima.pdfIn PDF document text
- http://ifaistos.reality.gr/~triantaf/images/file/63467315971.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c83d63420f165fa0bd78d504731d854e/54566252491.pdfIn PDF document text
- http://ebiocell.com/uploadfile/file///2021052111092964.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca34cc35a---92187924621.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_off0000dd53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD53	18204 bytes
SHA-256: `94fc27cc696de2ea9b8058cde215fa9285d86f456fdfec267fbcabd1a1cd0d5d`
`font_01_sfnt_off00010cd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CD1	10880 bytes
SHA-256: `7359dff188d3ea574725fa200db9b05c1474c206578252529e9e228b869e04fa`
`font_02_sfnt_off000125be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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