PDF malware analysis — malicious · 56fc70ec17a60881

MALICIOUS

PDF

85.2 KB Created: 2021-08-29 10:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 926460afa5281941a3d0a65275483932 SHA-1: f729156a5e1b15238d7607676801cfa459a35f6a SHA-256: 56fc70ec17a608818a58a61835750da8f27662b183b9c371dacbe9739167cee7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to host links on potentially compromised or low-reputation domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/uplcv?utm_term=the+great+wave+mount+fuji PDF link annotation
- http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/kogusivapudud.pdfIn PDF document text
- https://vidaleve.ind.br/ckfinder/userfiles/files/besaxifudanubita.pdfIn PDF document text
- http://alarmy-kamery24.pl/userfiles/file/xeweb.pdfIn PDF document text
- http://chinoboxingclub.com/clients/36032/File/98281030429.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bh0kj436kici26hg2fkka5lkn1/69855970843.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8m5j8nist7tkc698kufvrac1m2/pogejifukanumikawelitafek.pdfIn PDF document text
- https://marcuspietrek.de/MARCUS/files/file/8333583454.pdfIn PDF document text
- https://songhongresort.com/img/files/72963035048.pdfIn PDF document text
- http://reichspfarrer.sk/file/mizoxagawobefiderufa.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e949b82ddfce5f8f67a95af81077cd64/45225889096.pdfIn PDF document text
- http://mmprogetti.it/userfiles/files/werulidemudenurumag.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7479867ff6473d1ffa6c3f202bb96180/90953923350.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62691b28ff---sivamifor.pdfIn PDF document text
- https://gsm.company/ckfinder/userfiles/files/guduzeweroja.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ebb7a16a34a370204dc47e16b11e38c2/26765516963.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f1192146---37582992418.pdfIn PDF document text
- https://ev-owners.jp/userfiles//files/86882468429.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0211a3dacb73055dac0ed98726d929d8/39124120770.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd338e9347f---goborek.pdfIn PDF document text
- http://mwflower.com/upimagesfile///takivexeka.pdfIn PDF document text
- https://techielingo.com/fck_uploads/files/90170230826.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bc05906---42213754680.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e8130c1e618---47712488625.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i1jqmdno570a1pg5ct6tgal4vc/voxebavaxekoroxe.pdfIn PDF document text
- http://pinxedien.net/upload/files/goxedonaximuvugibesizo.pdfIn PDF document text
- http://brilliantsolarpaneling.com/userfiles/file/pubawepuwu.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_off0000e4eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4EB	18684 bytes
SHA-256: `5a18cef1082695b4e188f6b04cb99dc5553a2f6a62edb580fcca169d28da2562`
`font_01_sfnt_off000115c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012dd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DD8	10792 bytes
SHA-256: `a380d3a48f16c02163b4c8f6b6f79697bb8f9bf201f32b3d7346772d1ff5d037`

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