PDF malware analysis — malicious · b56704c5636917c7

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 01:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c09e210390cd8b6a66279e2c44a8a6c1 SHA-1: dda96b139565e0885b09826b37d273af7a89ec5d SHA-256: b56704c5636917c7f403dfdb1b1d3f646c3a4382c460197417276c752f5a69a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to what appear to be compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9635

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://laborke.ru/uplcv?utm_term=viva+video+aap PDF link annotation
- http://askaudit.ru/price/tolinerilavux.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631193085.pdfIn PDF document text
- http://chieucoingason.vn/files/16284377845.pdfIn PDF document text
- http://veterinariacasettamattei.it/userfiles/files/nefavotutigejemuguxi.pdfIn PDF document text
- http://zussobrance.sk/grafika/dokumenty/pevikufije.pdfIn PDF document text
- https://hzautomatisering.nl/userfiles/file/86267558752.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/735acf64b5ea2c0a2f31467a699868df/sizariwifajapoguse.pdfIn PDF document text
- https://glaze-metalart.com/upload/files/jivogaribenosanevubijilu.pdfIn PDF document text
- http://kennycojewelry.com/userfiles/files/202109/1630471482.pdfIn PDF document text
- http://easyliveconstruction.com/ci/userfiles/files/zanekotevefo.pdfIn PDF document text
- http://smogy.ru/files/files/8988349201.pdfIn PDF document text
- https://efficientinfocomm.com/ckfinder/userfiles/files/9072509073.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379f312b08f---27274151123.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
- http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pixewofipow.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354263bf5ee---93035544037.pdfIn PDF document text
- https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/tuxaluwisiw.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
- http://szpk.hu/_user/file/21006508779.pdfIn PDF document text
- https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wudobikuxokewuwezabe.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc0bdb06682415c0f3d0a2e4873c4723/57642621661.pdfIn PDF document text
- https://bccphil.paramedix.biz/uploadfiles/file/towefonaxebasojusubaju.pdfIn PDF document text
- https://kaskad-74.ru/images/uploads/37932284796.pdfIn PDF document text
- http://proximeo.com/ckfinder/userfiles/files/26994895647.pdfIn PDF document text
- http://newabel.com/ckfinder/userfiles/files/rabizubowebepujusaso.pdfIn PDF document text
- https://bdprescription.com/ci/userfiles/files/84315774344.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c0e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0E4	16164 bytes
SHA-256: `a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1`
`font_01_sfnt_off0000d680.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD680	1936 bytes
SHA-256: `9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583`
`font_02_sfnt_off0000df7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF7A	9904 bytes
SHA-256: `02e95e177ee1664bb2d8b22389e05d4847a663612c9096c47b7bbc8c19b6efef`
`font_03_sfnt_off0000f569.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF569	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00010d7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D7B	21940 bytes
SHA-256: `a5660a4595c8806e5cdfda8d3382c308908be9c8bc22c59208772cdb2cf0bb28`

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