Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0f768179f03fc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 13:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37f2f1a70c3672d260ae301b428ffd8a SHA-1: f5a4d9715d0030c13158bc15dfe54f62630053eb SHA-256: f4e0f768179f03fc1c1ff4a39aa9ad07ab70adfcfdce29092336a6c6673eaa46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=ben+askren+mma+record+ufc PDF link annotation
    • http://gavionescodeinsa.com/userfiles/27967587206.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914022158403820.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/20663289990.pdfIn PDF document text
    • https://patc.fr/imagesfile/fuwetolazabemofitotigudud.pdfIn PDF document text
    • http://effekt-film.de/files/file/41193697200.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5a3154539547cee7035445717b688090/51422678828.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce10915f41---95075846089.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/97098266569.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/65331888265.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/90564539972.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/gosar.pdfIn PDF document text
    • http://yuli-china.ru/d/files/19913199983.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/14755300080.pdfIn PDF document text
    • http://ametansk.ru/uploads2/sakejefibudilamobe.pdfIn PDF document text
    • https://premiersuli.hu/files/files/segogudi.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/69549338745.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344c2f64507---dobilivisijubuselivel.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/bojudivabarenolig.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54272662167.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/62779893230.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631550742/file/ridoz.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631812671.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf1f88620---jupewizamorujir.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.

FilenameKindSourceSize
font_00_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10644 bytes
SHA-256: 98abb7fe7431daa19c09de608880f0bc655e7b0dfa13e0e805da8b6865dec358
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17420 bytes
SHA-256: 271dcbb11a06cdcc20325b53b128eefe335abec23d5c6e79eb312c74d7b658f8
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1