PDF malware analysis — malicious · 40839dfb75908683

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 03:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: eae139a89985528007f7248b54c6b4d7 SHA-1: 80419c7adfe13d3444c0947b81b8d1362e0c6018 SHA-256: 40839dfb759086835120b5cdfb65a972335384801f6fd4a18f2cb4ba17c1b38a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other domains, suggesting it's designed to lure users to malicious content or downloads. ClamAV detected it as a phishing trojan, and the ML classifier also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9928

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.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57834fc36---93979439476.pdf In PDF document text
- https://contact-house.com/fckeditor/upload/file/47162826997.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d37d4ce8bea---xilujobetejazejavuriwo.pdfIn PDF document text
- http://neapol-m.ru/usr/file/weridewejamavimirusowol.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806547d48a9---mafufamukufevakoputirabuz.pdfIn PDF document text
- http://etcad.net/np/upfile/file/32319340263.pdfIn PDF document text
- http://narnivet.com/userfiles/files/bolat.pdfIn PDF document text
- https://elminhaj.org/userfiles/file/novuruniga.pdfIn PDF document text
- http://arlingtonhigh1960.com/clients/881088/File/3604715379.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1628359620.pdfIn PDF document text
- https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b424ea0d2669e322bc6a4acf2ad9515c/derukijurawogagidoti.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/1698432559.pdfIn PDF document text
- https://rainbowfurnitures.com/files/files/70287393713.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a81a726e65546c57162065af61d06c37/38567331097.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f3e82c1b495821782da661b733d4bccf/25653168944.pdfIn PDF document text
- https://livredart.com/ckfinder/userfiles/files/waliral.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/40118886701.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bs778tthafllsh25r9obgrg2u2/55275891272.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/7638926882.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58747c100a---59412057944.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb334b328c735ea309ca7bfd00ddc9b1/2401135916.pdfIn PDF document text
- http://studiolegaletrotta.eu/userfiles/files/totazetuzikipegeju.pdfIn PDF document text
- http://cathugo-yachts.de/res/wysiwyg/file/xuwajalijuzijas.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f64897149e4e630c98fb37ba4654e871/xuduj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tcpdf+laravel+6PDF 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_off0000c1d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1D7	10228 bytes
SHA-256: `f81e3e406782feaaece1f4f91ef7f8b0b8a6a810f0c4735e35afb92fef3be856`
`font_01_sfnt_off0000d8f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8F6	16368 bytes
SHA-256: `38a0a2374e807d730b46525382f09c47f7ffad21c5a195adf740c09c75925c60`
`font_02_sfnt_off0000ef79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF79	20808 bytes
SHA-256: `046cc4cca99e2759e45fcc8f60eec0979e38fc80929ca4ca336077f15d83529b`
`font_03_sfnt_off00012665.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12665	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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