PDF malware analysis — malicious · e54f17f4175330fc

MALICIOUS

PDF

109.1 KB Created: 2021-07-17 23:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a81d33b32da1f637eac13a5b262276e0 SHA-1: 35a88e9c886ca252da837f5bf80045b4554fa7d5 SHA-256: e54f17f4175330fc651d1fee5d9eacce6dd8e2a296afc40014abae2b6666f5bb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links redirect to other PDF files hosted on similar compromised infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9797

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/vvi4bu0f5ek2l58k2ibfntnu76/8124939368.pdf In PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774df44f3ba---vuzulobat.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4bf832ad009baa6b4dc7cb326dccc6f8/bavegu.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/60c290e45f2e6b31d656903c6e33dfdd/pepisavonafiwas.pdfIn PDF document text
- http://iccj.jp/images/uploads/fckeditor/file/wurativibexoli.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c653012c2ba---62867189406.pdfIn PDF document text
- http://farashimirooz.com/files/69537794466.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8heef37e2b2iur1kpjm21f2c0s/gagapekijexiz.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/867604cd23cec1f3191a3537bb88404d/79961574609.pdfIn PDF document text
- http://toyotacri.com/userfiles/files/67436106248.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/845krlfri18pcsmrl8932qe5i3/49286098659.pdfIn PDF document text
- http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/49781310384.pdfIn PDF document text
- http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/jovapiroboz.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8fdfbdc28c780af6a27380d7c3b90b0c/sarimozazimug.pdfIn PDF document text
- http://randoquad72.fr/userfiles/file/48567562985.pdfIn PDF document text
- http://thibangoto.com/app/webroot/uploads/files/xejukuxurutigipuzegilira.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc7ab0574---7670180108.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d86ac736---20287533906.pdfIn PDF document text
- https://topclassgreenery.nl/images/file/wofonuk.pdfIn PDF document text
- http://bluefield1966.com/clients/26642/File/gulevosabukefat.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba901a366---50087620598.pdfIn PDF document text
- https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/ed0bcbd78e6d62fea4d67651f9a0453a/83201784471.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/720dbdc1ff27c315d09bbf45cbdbbda7/duvidusisixarime.pdfIn PDF document text
- https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/50559848733.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/987ae3d97feee1f90f3ee7e0ac982d16/40680088731.pdfIn PDF document text
- https://allianztc.ro/files/file/14155475801.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=and+i+miss+you+soPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001470c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1470C	18600 bytes
SHA-256: `4338d297927c5db102f2fbcda962d797c5dc9e67ab834235251b9b688e7ffd45`
`font_01_sfnt_off0001773f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1773F	10064 bytes
SHA-256: `e7ac783b63bec312eeb53b14232c2eb0334ed8a71fd8c364eb24e2f9cd5a1edb`
`font_02_sfnt_off00018da1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18DA1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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