PDF malware analysis — malicious · d4b0cd9bffa1b2bd

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 08:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: c7e86079cc11faf2df13038d86b1578d SHA-1: 7a40c013522a21320742da0722f9aee701155c0d SHA-256: d4b0cd9bffa1b2bd79d8d8c2a0c7f4fe56bcd0d56c3c5540c1e14f509cdd4ea2

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may prompt users to call a phone number, a common tactic in callback phishing or tech-support scams.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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=3+exponent+negative+2 PDF link annotation
- http://lacasedescaraibes.fr/file/16784326163.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/930bf7b4ac16a5c4127f84b068450175/86433541379.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4fd54bf4bfc6522003398ee5bf320e9f/sazovitarunafi.pdfIn PDF document text
- http://chataphan.com/file_media/file_image/file/lamefagejer.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d64dcf483d1---dolupusakipivazerisebumaw.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/2049348826.pdfIn PDF document text
- https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0ii2s12pjsamrf7uhgh5uarcr3/75053236337.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/63bdddd9b176e845f53827844d96a8c7/vojiwakuwujufajet.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608765c0dbc07---45715387.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/611174de6d2e3bea6680b499d4533bee/geradejivevibakojo.pdfIn PDF document text
- http://arci-mp.fr/admin/File/73755404777.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0dcfd446ec3cc783a6e62023e439aadb/61717351060.pdfIn PDF document text
- https://agmatbaa.com/upload/files/28412328498.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/e70v40um6g5iceb4agpnk06t90/59766937169.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43a57b5e0---kagewipuwebiligiwoduwogi.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/42b2753f8b827071725b832beafea3c8/91539455596.pdfIn PDF document text
- http://amdind.com/userfiles/file/63984017551.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007d5aa596---96789987995.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0ju5m1qj74a6kkcdtl9iqn85q7/4226190092.pdfIn PDF document text
- http://tano-cable.com/d/files/62798029558.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609836f835891---7032471780.pdfIn PDF document text
- http://vector-luczak.pl/new/fck_user_files/file/fijez.pdfIn PDF document text
- http://abwmarlboropike.com/uploads/files/fafopifajemegilinaxaxor.pdfIn PDF document text
- https://airshow-bg.com/file/88199306522.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/emp785qt1jrlkccdugtaavltgk/75111692536.pdfIn PDF document text
- https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/31be5a50e52aed7dd1fc820986f1ea75/2647265504.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_off0000e7a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7A2	10476 bytes
SHA-256: `8dbe6980eef1f5e5312fd2e4e7d1437f85b812155ce42ba8d6357c18834b1ba6`
`font_01_sfnt_off0000ffa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000117bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BB	17592 bytes
SHA-256: `a4b0fef31a4024580f67ab74c64c58179a3ba6d0d2a4a88061b0ebbe23bd5fbc`

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