PDF malware analysis — malicious · 77f13d8c0cb73673

MALICIOUS

PDF

76.9 KB Created: 2021-07-01 16:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1c671caa13640be316cf4dfad94a4211 SHA-1: 754f9e6b454ad9cdd80d508e6931542b33cacebc SHA-256: 77f13d8c0cb73673b75d0f3897910adf0dfcd917299780e0f2976ab532928aed

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to compromised WordPress sites, suggests a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://bulk-supplies.com/userfiles/file/bimulonefisukurimotaleg.pdf In PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084093a9d4c4---jozexagesojelurepeduv.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c813a3193---nagemujoxazamokixoba.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5098ead25a7993caaf3a9448337c451f/maxuwosunufokavotejat.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/872589e21a8817b116f9fca34ebcf4ee/59056860070.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fa1pg499q3af9fi7a1nligkfui/tikiwatixezukedoluwumo.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/3ebbe9e7d25b0e5e99dbb2a071f419b7/15837686636.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd1a0b2a7---pavubur.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f84abd6f---farulezolu.pdfIn PDF document text
- http://ofipapel.org//ckfinder/userfiles/files/23705542484.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bahh2m3aug0jtgbvujuua6sso9/lelubexefipozikibukesilo.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ffa006d5ab18ca599a425b48bcba9c72/fojezululota.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/efdt9c2dhaj1i54m39c36v9l30/nujutezuzexifaxutixa.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a801ac39104---85564717618.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8e4d49c3---70264899385.pdfIn PDF document text
- https://kodcomputers.ro/2664/uploads/61329958870.pdfIn PDF document text
- https://abeess.com/userfiles/file/43156890780.pdfIn PDF document text
- http://fontanarosaserigrafia.it/userfiles/file/13168259786.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/06e599665d02913b373042087a829ad9/52780235645.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2064bca0---29503638891.pdfIn PDF document text
- http://mebco.ru/images/file/saxidurozovesapofukowuluz.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2f9587576886b455c989cb8de72307ba/66244497713.pdfIn PDF document text
- https://candbco.com/ckfinder/userfiles/files/70365496166.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c5667632.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/adb494f918c74c16a7a3339aa8ca66a8/movubexabi.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc74ce49a3---jekusirufisuwewo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=conditional+type+0+1+2+3+exercises+with+answersPDF 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_off0000c825.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC825	11408 bytes
SHA-256: `5419ee0d12e2b0a375986d5211659c40d25500d660d41891b0ebecbf64266948`
`font_01_sfnt_off0000e33b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE33B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fb4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB4D	16584 bytes
SHA-256: `115bfa550f725e3e07924e1c5261d540b7b3646a710f42c69b103b18a41786e7`

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