PDF malware analysis — malicious · abe2710d9fe16181

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 03:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: eaa79c03a8ee29a51018f8ebafbc6de6 SHA-1: f2562019e65e7f4e20ed9847ed392ebea9a1b262 SHA-256: abe2710d9fe161815862e03d24cdfe3af027e00e17b5c144c8589f77ec566f37

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating compromised CMS uploads and SEO link farming, strongly suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://krisoc.ru/uplcv?utm_term=coolie+no+1+download PDF link annotation
- http://orthodoxvaidikasanghom.org/userfiles/file/jakizibeji.pdfIn PDF document text
- http://ilkemymm.com/image/files/50145261940.pdfIn PDF document text
- http://goldendoodlesofthesierranevadas.com/userfiles/file/1877342890.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/patosefesokan.pdfIn PDF document text
- http://elmbbq.com/uploads/files/kikikofexiguragafawaro.pdfIn PDF document text
- http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mewebu.pdfIn PDF document text
- http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
- https://molecult.metallo-tests.ch/sites/web/upload/files/tetopoz.pdfIn PDF document text
- https://laundrybyconrads.com/nbloom/fckuploads/file/petabida.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf77af0fec7b1d7e458572c99aebdf4f/paperupaze.pdfIn PDF document text
- https://3eyamaichi.com/upload/ckfinder_temp/files/20210906231842.pdfIn PDF document text
- http://studiosiciliani.eu/userfiles/files/66581562197.pdfIn PDF document text
- https://muguet.fr/sites/default/files/file/telusowakivezumepaniz.pdfIn PDF document text
- https://0955205219.jwa.tw/userfiles/files/vitiji.pdfIn PDF document text
- http://newbiesites.com/userfiles/file/defelusimonosob.pdfIn PDF document text
- https://igraonica.me/userfiles/file/39588582062.pdfIn PDF document text
- https://partnermind.cz/images/files/4015014086.pdfIn PDF document text
- http://bainihu.com/upfiles/editor/files/kivezilu.pdfIn PDF document text
- http://origo.ws/userfiles/file/bavazolakemowufofifizewo.pdfIn PDF document text
- http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/12230731875.pdfIn PDF document text
- https://giltmorestukko.hu/ckfinder/userfiles/files/72398012467.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4f21f62f22a6c476929f3ddd4c5888b5/54163660504.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973253375---3507035773.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_off0000d3eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3EB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ebfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBFD	17268 bytes
SHA-256: `5999f38ab3e4909812464d325a7454f4cdef999b86a6ec306dcbe63f38fa0411`
`font_02_sfnt_off00011911.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11911	10044 bytes
SHA-256: `0025466cad54ea22611895922b9c8662ae62fc18bf36959a3d64f2b9d0871470`

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