PDF malware analysis — malicious · 51d2676a7d6599a2

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 20:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4a941cc8ab7ade45a825477adcae37d2 SHA-1: 95ad09092f240d075e3457ecd3e68c57fb9d2680 SHA-256: 51d2676a7d6599a248c75869e4766ab86c43ad58481b2e4ff1defda26940d059

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://ketchas.ru/uplcv?utm_term=how+to+check+spy+app+in+phone PDF link annotation
- https://j26clean.com/upload/files/zajoxavazeposibowofesepot.pdfIn PDF document text
- http://brandnewgoods.net/userfiles/file/duvivisusunurerid.pdfIn PDF document text
- https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
- http://dynamic1984.com/user_file/file/noxafodabusi.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/83851259053.pdfIn PDF document text
- https://eminenceconstruction.ca/viking1/uploads/files/24407697220.pdfIn PDF document text
- http://pokebarslo.com/uploads/files/7419077786.pdfIn PDF document text
- http://bischofs-scheune.de/userfiles/file/jojejuvofofabugoxu.pdfIn PDF document text
- https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zizadoxem.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8dvreuk1k9eft2dpiir4dkn631/lisif.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/sixibafiwedopozux.pdfIn PDF document text
- http://suchanekstomatolog.pl/files/file/pevafubivo.pdfIn PDF document text
- https://webmakler.org/userfiles/file/sifave.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2b305a507cf921ba944112ca90f250df/78711590874.pdfIn PDF document text
- http://munnartourism.com/uploads/file/piworodofemisarojikuredix.pdfIn PDF document text
- http://kochamsushi.pl/UserFiles/file/lilepara.pdfIn PDF document text
- http://c2r-auto.com/uploadfiles/file/2021090122535173499.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d5n24vngl1vieomu1kqknh45hq/gitaregujado.pdfIn PDF document text
- https://blsautomation.com/ckfinder/userfiles/files/gafisisiruwuvo.pdfIn PDF document text
- https://spandoekland.nl/userfiles/file/daxedoxukegutatug.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983eca6776---lutav.pdfIn PDF document text
- http://interstroy96.ru/uploads/files/wuzavufiwefugesubes.pdfIn PDF document text
- http://www.lbtfilm.com/uploads/files/nasitugowo.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/zuwevowazapu.pdfIn PDF document text
- http://drukarnia-skawina.pl/app/webroot/media/files/50556611057.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_off0000e4e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fcf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF8	10608 bytes
SHA-256: `b323c623475c1e2a619fbab8f8bc12878082ec0325c43ba5ca93485e94e3ff96`
`font_02_sfnt_off00011543.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11543	17588 bytes
SHA-256: `21e36c2551a5cf134ee7f7fc71a68d0a278f4ed219bbf3d174aa0098ba31ee57`

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