PDF malware analysis — malicious · f5c9adbaf3216076

MALICIOUS

PDF

87.0 KB Created: 2021-08-13 22:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b0c867c6868466af3d765d77103dc035 SHA-1: 19b9165ccffb17996f52dfa3d7fb5fa6d3f5c8cc SHA-256: f5c9adbaf321607628d2e977291938ec4e7fe4eeb119f66d1f9ff35f86c4b1a4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm detection further supports this phishing and redirection attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=antibioticos+betalactamicos+pdf+2019 PDF link annotation
- http://mfcwestenkwartier.nl/beta/userfiles/file/82262424848.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d3e6056ba---xasipabazot.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/suxelavovas.pdfIn PDF document text
- https://arhometutor.com/userfiles/file/43759029543.pdfIn PDF document text
- http://chemonova.com/FCKeditor/file/11449973465.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/54593199554.pdfIn PDF document text
- http://iwort.de/userfiles/file/vesanovimo.pdfIn PDF document text
- http://iccjsc.com/images/uploads/files/69899052158.pdfIn PDF document text
- http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a816f3634---37934486865.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/stuscsp1a4n04hvofdfrhlcagb/70062495468.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/76435747076.pdfIn PDF document text
- https://butterfly-propertymanagement.com/userfiles/file/ramusurenupukesegomiz.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e07f2daa4e9924ff3b709ae41e5af533/geratoruk.pdfIn PDF document text
- https://exporoaster.com/app/webroot/files/images/pages/files/zenogu.pdfIn PDF document text
- https://harkakotony.hu/UserFiles/file/goxunufobalanafivizurip.pdfIn PDF document text
- http://trimblehighalumni.com/clients/84492/File/futivugolotewasawejuzelif.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df5acca4337---86880584511.pdfIn PDF document text
- https://silky.ae/images/bulk_images/files/61665354282.pdfIn PDF document text
- http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/16344343367.pdfIn PDF document text
- https://art4you.sk/editor_uploads/system/files/73121413180.pdfIn PDF document text
- http://fashionflutters.com/ckfinder/userfiles/files/xokoxunuzebowuxebezajaku.pdfIn PDF document text
- http://steakclubhn.com/campannas/file/wurawomapujanopogoj.pdfIn PDF document text
- https://mangmalungtea.com/userfiles/file/fibiliraxazozinevavijiwom.pdfIn PDF document text
- https://mashtalkandil.com/userfiles/file/93438843786.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_off0000ed16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED16	11264 bytes
SHA-256: `5b1c7b7aa19d66e865cd14c1e2a44c3fbccad220f026bd0227862d842c756599`
`font_01_sfnt_off0001075e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1075E	17656 bytes
SHA-256: `19cb05bc9c915ec76f508cc4792cba130c80032d2df6b4bf3edc6ab08898025f`
`font_02_sfnt_off00013409.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13409	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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