PDF malware analysis — malicious · 8225aa8ddea5d646

MALICIOUS

PDF

81.1 KB Created: 2021-07-02 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d61318774f3377859580b5b63bdc5639 SHA-1: a502d13bcf54f93089d658835ecb18d0c8b7a626 SHA-256: 8225aa8ddea5d646fd015e207c5c6925189bfa474bdb55165edd347088588e3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=wimpy+kid+the+ugly+truth+pdf PDF link annotation
- http://universalestetic.com/userfiles/file/lebeditalokalokukinulo.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2cchqquvpr1frlfah3f226bf75/xibijaxebuxodumarudunusaz.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acae35bb0---juzonubeb.pdfIn PDF document text
- http://energy-labels.com/userfiles/file/84138529826.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6d0a4db9936da08bb26c1f039f8029bd/bisofikorigokomufipon.pdfIn PDF document text
- https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e9e542f6b85534e851da147dc6c86879/58925509052.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f83da5303---8184726106.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/ae6a25c24579f6fdc0eb2402b8ecab86/vivenetetimegatokazujedob.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bf759614fe1e735acdd441d5833470e9/befenowakutib.pdfIn PDF document text
- http://palenice.net/obrazky_clanky/file/rizuvotefotu.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883da4f62d---12635585841.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badbb49fafd---16950675255.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da1a22554---pekafinepigomudupipuge.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795619a5917---xojorenu.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4512c26bb24540b64123f9240c4a7b30/bafudasusosige.pdfIn PDF document text
- https://avvocatoboretti.com/file/7669488685.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghapbhktmcr20ie5768hh9i1ra/gojupibepusil.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/dosuxufikotupamef.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/48559671580.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7092e297b23067b69b58af61abd8422e/sesinuzojoperexizovem.pdfIn PDF document text
- http://atdawnwelift.com/userfiles/file/winobuj.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a729160baca2665c3fb1f3e7fc5d5a51/wagojaludekemumelafadoba.pdfIn PDF document text
- https://betalinktech.com/blmedia/file/sepujolunejudovada.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_off0000d86f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD86F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f086.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF086	10688 bytes
SHA-256: `ed2990f09ce5539dc511c095dbeaff1e67c2a05c55197ffcf433750ffe4e5db5`
`font_02_sfnt_off000108c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108C3	17116 bytes
SHA-256: `b6932a2c29da12bce7c2757c3e52b8001bd3ed1e238c69ae22350d514bf42fca`

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