PDF malware analysis — malicious · 8a3f5dd572fe2419

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 13:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: e0b6dafb287f8491163ea78fd219374b SHA-1: e2cc2b5bca6077c9f5c25b2940d95fdbb9a143e4 SHA-256: 8a3f5dd572fe2419d7671fe29fdf48c79595b13d1d6d8687fffe2bcd862137ac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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.
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://crewmak.ru/uplcv?utm_term=play+free+games+online+without+downloading PDF link annotation
- https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/nisisekijafaxogaloz.pdfIn PDF document text
- http://ricarda-allegra.de/userfiles/file/rimupu.pdfIn PDF document text
- http://hurtowniagrafit.pl/userfiles/file/zivutotolave.pdfIn PDF document text
- http://skinct.com/upload_file/file/Fl202109021645147951.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d931a588d---pimudopobewu.pdfIn PDF document text
- https://cribpointonline.org/cribpointonline/userimages/file/bedesilenalorixetu.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/tiwebereredugoludevixoxem.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150b671e1c2f---pimerupipuragevo.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148129cbab13---xuxusi.pdfIn PDF document text
- http://nandishoverseas.com/UserFiles/File/gewolajomokivo.pdfIn PDF document text
- http://csc0311.com/userfiles/file/20210924132022_ui31bu.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/803469f53679808ef2e9869149462156/41821768506.pdfIn PDF document text
- https://www.sensiblemachines.com/ckfinder/core/connector/php/files/2695667568.pdfIn PDF document text
- https://mygoaltv.org/ipp/images/uploads/files/49843186400.pdfIn PDF document text
- http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/45182017237.pdfIn PDF document text
- http://morebricks.com/ckfinder/userfiles/files/bupesidelut.pdfIn PDF document text
- https://westhygiene.hu/editor_up/47742565239.pdfIn PDF document text
- http://mestav.sk/uploaded_images/file/68109009892.pdfIn PDF document text
- http://nationalcoopadvisors.com/userfiles/files/ruritasatomitavujoxufami.pdfIn PDF document text
- http://rileyillustration.com/images/agency/files/93501995824.pdfIn PDF document text
- http://kahasat.cz/data/file/joniwumipenijuf.pdfIn PDF document text
- http://honeystraw.com/uploadfiles/file/17094354241.pdfIn PDF document text
- https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/61016049609.pdfIn PDF document text
- http://ttlh.vn/storage/ckfinder/files/46990872519.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161470e906bca5---97379559155.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_off0000d931.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD931	18352 bytes
SHA-256: `91c12606f6b34dbb18b5974dc82e39278db5d6069396f02b2228db5168d18906`
`font_01_sfnt_off00010899.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10899	11104 bytes
SHA-256: `dc88299048afb3614de2efadf485b10d4e7045739fe76f1f3927027a8f628a68`
`font_02_sfnt_off00012235.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12235	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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