PDF malware analysis — malicious · 211a91bc47331fb6

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 05:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 99e9c5dae6c359f91c97f3a730b647f4 SHA-1: f3b4e89ee1e68577c6c7996de4a66d38163bf41b SHA-256: 211a91bc47331fb62a8bcb989458b52c7e11080c38979e2aa6169818306ab312

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm used to redirect users to malicious sites. The PDF's structure and embedded links strongly suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9876

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=to+calculate+molarity PDF link annotation
- https://stmpallet.com/ckfinder/userfiles/files/xepofikexewo.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f358931d09a---zogibokuvukowula.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7509073a696caa7305febcfa224f9542/toligofubonazulaba.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664522d87a---98406046726.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u4jk6vuo3bhtjv0r7r2je0fsfr/54217753357.pdfIn PDF document text
- http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/zeruxari.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bibevubumoredenegofojej.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f460d4e43---zekesabevanugaxurimelufep.pdfIn PDF document text
- https://samarthanamparisara.org/apadmin/uploads/userfiles/files/76110393660.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38dd06a08b---fuzunalix.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/89322783888.pdfIn PDF document text
- https://chogmai.org/ckfinder/userfiles/files/fuwosakododokarisoso.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210728170751_lk8rcd.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14fdc5f0f---80453622383.pdfIn PDF document text
- http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/31490616706.pdfIn PDF document text
- http://sethhukumchandschool.com/userfiles/file/19665512640.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/10f1138777260b686520b6d12baeb95e/nopebikozalila.pdfIn PDF document text
- http://www.elstar.ru/uploads/files/xajidibuzasiwigekefuva.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddacc1a9b---jazogugirofowudugogu.pdfIn PDF document text
- http://coreaad.com/DreamDataUpload/file/veverosovidumusuravom.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df569464d69---nonukojolajopetexuxa.pdfIn PDF document text
- http://www.childofafrica.org/media/userfiles/file/filebekurawa.pdfIn PDF document text
- https://m-isc.com/userfiles/file/10510724872.pdfIn PDF document text
- http://hoadon-dientu.net/images/files/63580092659.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8559333563eac888664153fa77a161da/52633918481.pdfIn PDF document text
- https://www.rt9.rspo.org/ckfinder/userfiles/files/95294414016.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_off00010a6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A6E	18892 bytes
SHA-256: `b6f15c13d06f5c7296073eaa2a2aaf0a2e62c41947ef10e3f7b78eea2955f747`
`font_01_sfnt_off00013bef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BEF	10296 bytes
SHA-256: `fbc82d83b99c64624e88101b1fe88936c44695ca2c54a444c86d2b3459b377ab`
`font_02_sfnt_off0001532c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1532C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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