PDF malware analysis — malicious · 8a3cd35fbc652176

MALICIOUS

PDF

83.7 KB Created: 2021-07-29 17:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 4da2709b56ea5f82e8d299922f6380b3 SHA-1: 2cca6f72f0d013b3ca88168dd6e683b83a9eaea4 SHA-256: 8a3cd35fbc652176dcd977fda21be925099dc05c70f267d07f3ae1fb4980c78d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as a distribution point for phishing or further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 https://irlanc.ru/uplcv?utm_term=final+fantasy+vii+remake+pc+emulator PDF link annotation
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736f18eab4d---mewezexizabixofizibepepab.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5b82da4ff50f47d9339809586f988f1a/lukom.pdfIn PDF document text
- http://interwork.sk/userfiles/file/66684146439.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/gagulosuwupadezeti.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2c2a11ec7695a3e79b6122d6aa3cda41/suxepumanivarut.pdfIn PDF document text
- https://actorconseil.com/files/file/91976144398.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5de70bc1---45129395174.pdfIn PDF document text
- https://bayihoki99.com/contents//files/13876897590.pdfIn PDF document text
- http://cnokorea.com/userfiles/file/31056731552.pdfIn PDF document text
- http://csc-021.com/userfiles/file/20210628034429_btwwma.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4868cc5cab16a76716cff2a8c36ffd2b/39875375528.pdfIn PDF document text
- https://barrierball.cl/ckfinder/userfiles/files/zozonovo.pdfIn PDF document text
- https://technische-dokumentation-hoffmann.com/upload/files/40070571348.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096854d3e7cc---85456630267.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dbh7tungckd2l3hljal8rsua12/51438154765.pdfIn PDF document text
- http://yossy.biz/userfiles/file/288727694.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8i898bdp81dsnspc7pfdkk1t4e/54694546493.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f9db43aaf0512aaa99475f1bd4c89fda/80420197283.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d643900f7---72526238894.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d9c1f8f4---71272370442.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e444bc7d7---3414899349.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/12adaeea0a5f673e6adf2713570e77bd/59916755751.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/817140edc6e6fef596c687ca2987dbc0/801885516.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ac20111e---vomoropelibal.pdfIn PDF document text
- http://comp-art.ru/userfiles/file/90633656600.pdfIn PDF document text
- https://larioenergy.net/uploads/file/98416403865.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_off0000e15d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE15D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f96f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF96F	17356 bytes
SHA-256: `2f582dbe0cdfbcc722f01c8775038d86d73fb504d300244b3eba318d9e62d23a`
`font_02_sfnt_off00012724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12724	10992 bytes
SHA-256: `28be80670c2abc6964808e272fa4c27c384eb01b50e7f7e3fca00dc672408adb`

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