PDF malware analysis — malicious · 8c45d50a3b32119f

MALICIOUS

PDF

92.0 KB Created: 2021-07-02 16:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 7833d2df77e8d9ddcbf518ac7a39c838 SHA-1: a8211b08d6ec9105a50f438c065458d1afe59add SHA-256: 8c45d50a3b32119f4c39363f094a362cc9a3ff8f3473a3ba8dfcd96d7d099ac0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4d8d7de93579dcdf2085eaf4935d1489/31032936974.pdf In PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/934ea1feaab0e709cc497712fa3d43a5/71544294647.pdfIn PDF document text
- http://bkbflooringusa.com/userfile/abbey/file/87225521564.pdfIn PDF document text
- http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827aeda49a6---76183910853.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7a61e14c38455ee09185945f968a9443/64640850004.pdfIn PDF document text
- http://vivaibonomo.it/userfiles/files/17407588724.pdfIn PDF document text
- http://mastervgtour.by/var/upload/file/75008665193.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be8b4602b---84016435706.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2fff7b8521f5d09911d973c66e3a2e68/13527515185.pdfIn PDF document text
- https://marljivo.hr/userfiles/file/sidimetudadupegigiki.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071183928e37---zugibatizevov.pdfIn PDF document text
- http://work4shop.cz/userfiles/file/salejanabodofukisiwoj.pdfIn PDF document text
- http://incucinaconalberta.com/userfiles/files/sozumumikoxowimetopuwima.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf361681---gavoxomunaxalerezoga.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/342bf5d774fe2b7909add4069f3afe57/55942664066.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/wolagobosujovefusogevafe.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/324c37814cf1579ef8501c31992fd0fc/73829586239.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kjj0oagjeknfgphjv9bbhei2v6/vulevara.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/99611843486.pdfIn PDF document text
- http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/lumibowob.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d6402ffd934157f45669b4a29fc4fd37/31923751635.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/368b20fa5d790c157132b0b10718ff52/moxogikenoviwasix.pdfIn PDF document text
- http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/litewu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=message+android+webPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA04	18416 bytes
SHA-256: `660307c04aac5bc470dce8eb36f7bb480169b1ec42a9645a374a2adebb489ae6`
`font_01_sfnt_off00011b00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B00	16204 bytes
SHA-256: `8bcc070ff20c027f7494cea7f783612adf7e1b6d7f8765a9ac06f5986c6e82d0`
`font_02_sfnt_off000130d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130D3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000148ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148EA	10500 bytes
SHA-256: `533fc584b32bf11f3100975d6a799acf0ab8205f08e3cd28e68931e1b1d1ee0e`

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