PDF malware analysis — malicious · 9618003b58207850

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 07:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a89904d7c46a716b215751293ff6e547 SHA-1: 779657ebb3db6a7af7e0fa058259f548427c9f0a SHA-256: 9618003b5820785088934ea03df9858b747dc748abcb87bf70def8ae8e43df55

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded content are consistent with techniques used to obscure malicious links and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://kath-kiga-bw.de/bilder/berichte/file/83854423453.pdf In PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rsr2bnc13j4t4fum06k99ls1bo/jokar.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/31513da4f866166d9126a39df88fdb0d/likemixolopozujir.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca8b661ec---tawefusuk.pdfIn PDF document text
- https://shiokerbau1.com/contents//files/tujabituj.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/30m3ui9kcn3eruflvmrksirqk5/41422339202.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5cd1019d3afd16d962645688b33a1f19/pazedapotunisakurapinap.pdfIn PDF document text
- http://bulongvungtau.com/media/ftp/file/24126745403.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d06fc9a23a561b2ac5f93b7b8c540c28/10715664645.pdfIn PDF document text
- http://www.specemc.ru/upload/files/38838687073.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f2fb0887---54558811911.pdfIn PDF document text
- http://xingzhongjing.com/userfiles/file/20210826092523_1815680950.pdfIn PDF document text
- https://pointvirgule.ca/upload/editor/file/87999348470.pdfIn PDF document text
- https://orderpoet.com/ckfinder/userfiles/files/pubosemon.pdfIn PDF document text
- http://kibbkw.com/uploads/file/direkozamop.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cf917f3b62d79df7a61596268ecbad1b/9523261707.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/12675cb0adfe2ebb971d8aecfbd4ce0e/zaruzibufelafewedu.pdfIn PDF document text
- https://dolphinsolutions.net/ckfinder/userfiles/files/77180186901.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/40c6535ca81220413abc4c690d611cea/pakojuxajefilejajunep.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca274a59b---57861088635.pdfIn PDF document text
- http://cathugo.de/res/wysiwyg/file/24563220974.pdfIn PDF document text
- http://bigband-ulm.de/userfiles/files/32727129524.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b07f8c3---79320704543.pdfIn PDF document text
- http://myphammonly.com/luutru/files/vepafuzeju.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/62794076567.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/96239506756.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=antrag+schwerbehindertenausweis+nrw+pdfPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e9d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101EB	11040 bytes
SHA-256: `f7a579e813ade96ca38e68244759d86c4352f95f46dd7e640e54fc63ae276116`
`font_02_sfnt_off00011b3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B3C	19804 bytes
SHA-256: `23b4a49e063656f6b01d69060c271bcb8402420dc6f4d4030ec67b11ac55a229`

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