PDF malware analysis — malicious · ae3451b82d2a1538

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 04:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4aea75cf44c0404f4b6f6a96b5c2ac22 SHA-1: a95468db78d8a9cd587b7940cc4ab8f9e1f1af2b SHA-256: ae3451b82d2a1538a8b54f95e7d48427a9f66121b069c44ee6030287e7be71b0

156 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 websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://ehomeforeclosure.org/images/file/wasifaxenoxapapivizotefa.pdf In PDF document text
- https://unibel.pl/pliki/upload/file/tokekuwuxevibamupumar.pdfIn PDF document text
- https://adtw1.com/ckfinder/userfiles/files/51179981602.pdfIn PDF document text
- https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wevunakajopudefofuw.pdfIn PDF document text
- http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/21309021769.pdfIn PDF document text
- http://influences-vegetales.eu/assets/Image/files/muzejanavupuregikus.pdfIn PDF document text
- http://moveworldtogether.com/datas/files/55365514408.pdfIn PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109161625509258.pdfIn PDF document text
- https://cornwallstaffagency.com/userfiles/file/puzomi.pdfIn PDF document text
- http://smsgurugram.com/miet/assets/files/bufozabatodixemunel.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2842ec60db0c365bc3cab4afd76a7785/83895795122.pdfIn PDF document text
- https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vodimopilexuwo.pdfIn PDF document text
- http://saddabro.com/userfiles/file/wirowegunalolonopud.pdfIn PDF document text
- http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/mudinutisedifeviboleludop.pdfIn PDF document text
- https://alkirbilaw.com/userfiles/files/gireguwisalurititusepi.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1efdaa8b0---sekowasopipubete.pdfIn PDF document text
- https://sharmtocairo.com/userfiles/files/85249436292.pdfIn PDF document text
- http://savemaxint.com/files/file/gamesu.pdfIn PDF document text
- http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/gisafatuxexefudow.pdfIn PDF document text
- https://onlineadda.organicemall.com/ckfinder/userfiles/files/65309142841.pdfIn PDF document text
- http://sozopolihills.com/userfiles/file/3629793226.pdfIn PDF document text
- http://sxnqx.org/upload/file/Fl202109051328552592.pdfIn PDF document text
- http://vrzion.com/data/userfiles/files/65486237143.pdfIn PDF document text
- http://lnaixi.com/userfiles/file/20210912204359_353080454.pdfIn PDF document text
- https://hsse.cl/files/bexusosikap.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2eed861edd1447ff8a64b82059d5e766/letubofenutixotapule.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=voice+changer+for+call+apkPDF 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_off0000c933.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC933	16808 bytes
SHA-256: `f32568634ead8be0efd52d47d2ff03e4d286ae7d9b963ee572efd4bedcf1dac9`
`font_01_sfnt_off0000f461.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF461	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C78	10556 bytes
SHA-256: `08b9c2989a371c8ad881f3899c6d64a43dd8bf6fc34317f8d578351ee33cc276`

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