Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefb48d1020c4186…

MALICIOUS

PDF

92.6 KB Created: 2021-07-30 02:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f6a4348d2ab70fe1dbd53861327024a SHA-1: eab834b0f24327aa3b730b0a3df70af374ea620b SHA-256: fefb48d1020c41863d15f177db815ada520e15c24382565b17697e597a70fd63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including those hosted on compromised CMS platforms, suggests a phishing or credential harvesting campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=hindi+numbers+1+to+100+pdf+download PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ven2ok6tftcj3jn22a9bctv7js/tadunuzisono.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160741dfbe2a8d---gisug.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa162cdeaf5---zobofukepekefo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/24165316353.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/xawedekuvamoguni.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799bde13e3a---94392387375.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/e6kkoaf2h8mj5gljjheefg9lk6/fawerepipobo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lenolefake.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/kivowebisimefidarezazev.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/37514036971.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b6c00dd0276f80d129d8c9d1c1015f77/11654495846.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4f7d6c82fd623465879f0446477d4067/60342440862.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68ae587e3---56316293637.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/77866337311.pdfIn PDF document text
    • https://arerp.kr/data/file///91119335142.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c31c560be---zizigojafekugajaj.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/57386895144.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8d86ed6d08feaf2061cf573954b38091/93010764736.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf55e77ec---tovifidadageluxavoxumuxik.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/56919328926.pdfIn PDF document text
    • http://edgecs.net/documents/83712030285.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3dae6aeb25041feab0ff6315e601d6ce/buromaz.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/nigizuvipafug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 17424 bytes
SHA-256: 6e0746cd64a6027dc3b13f4476894309f78e909021c084e0d2890f7782643a45
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 11148 bytes
SHA-256: dbf5e0bcec24a74bb2c713bfe82bc9479fdbdc2dbbd16a7dc070fd547335085b
font_03_sfnt_off00014ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEB 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb

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