PDF malware analysis — malicious · 41e7571c84cc7c12

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 16:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3ccbef2cce994b1d7c0743758ed8f0fc SHA-1: cc762ddbef2f302096b32ef6c550d29e6997e0f3 SHA-256: 41e7571c84cc7c12f4459692c732005e17555a9b70fa2d2dbb97b887e9394737

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous URLs hosted on potentially compromised CMS uploads points to a distribution mechanism for malicious content, likely a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a6917597---9736278404.pdf In PDF document text
- http://katachizu.com/img/news/files/55615916504.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89ee4c2ab---vutonajezefesojokaralugo.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e8a0868e---11280541163.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c953c8912ae---susetuzatexaxegiru.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/85c3220d763e975952f8302a80ef1917/8816671322.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e63f88009---lonadisaditogejisunisibox.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/njvomgcj31fkrrvckck1qlfu1l/nivavaganarofijakasax.pdfIn PDF document text
- https://skinrepublic.vn/webroot/img/files/bugaxikojirovapufokuvev.pdfIn PDF document text
- https://zegabilisim.com/calisma2/files/uploads/xexurulob.pdfIn PDF document text
- http://xn--dlek-5qa.com/admin/UserFiles/file/1901200420.pdfIn PDF document text
- http://playitdirect.ca/ckfinder/uploadfiles/files/bajapukab.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c1aa7479eef4736155e8a42959551917/76359794138.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806666cab9---xoxufixigarurugukuwubav.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b566f95e278---napifugotipofuwe.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe05c24a217---28045829680.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8dea940aad683e72e7f12f727a0be14d/56563450287.pdfIn PDF document text
- http://robwalker.net/fckupload/file/vimobagebiputukesevapa.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4ef1b5016c4f1847cfa388f79b4da210/22800844744.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a163c80ab74ee137c6d25d15be81fe47/68714441681.pdfIn PDF document text
- http://blatt-gruen.ch/files/towepel.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/34872963841.pdfIn PDF document text
- https://akonis.ch/userfiles/files/38290401833.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+fixer+bernard+malamud+pdfPDF 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_off0000eb13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB13	10680 bytes
SHA-256: `708f4b8af60f8e204fe3b974b133785cded7eaea2e9c32e45548c62683ebfb5a`
`font_01_sfnt_off0001030c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1030C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B1E	20640 bytes
SHA-256: `7ecc4ef15817ce4dcdfccf2313dd2c90ccab31cea1e7225df008348a66f5fe05`

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