Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a891ef663bd4de…

MALICIOUS

PDF

89.9 KB Created: 2021-09-13 12:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 061e88f7a06804c3499a5618fe96ab4a SHA-1: 325175f7f2b77bc67125b3788ef1149f9ee58729 SHA-256: e3a891ef663bd4de3cb28e41c0a3c6f74864a0ce4b98f3b39f37d8d0f0ea3aee
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a social-engineering lure to install a browser extension or update, a common tactic for credential theft or malware delivery. The document body is heavily obfuscated, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333e54b24a---56770803577.pdf In PDF document text
    • http://opersan.com/file/80459512831.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/6720320998.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/buwemegux.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/45384142986.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/gexegamipizuwilinibumito.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902113752158697.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/mujiwisujifoset.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/wawofubodovoxam.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630737183.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zaxipilenudiluvimurenod.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/daeca51a267fab11acd183a2be22c356/28772542584.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ovinupipuwov.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021941547515336.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/64290801164.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/68703271016.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/zujatu.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/96268988873.pdfIn PDF document text
    • http://abwrva.com/uploads/files/86106778277.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nuvalipopiwumikuri.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/43521231412.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/22194474767.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/zemuposusijokugakolu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6klusrf477k5897aspbns7pkv5/23282539850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=why+does+every+app+on+my+phone+keep+crashingPDF link annotation
    • 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 11080 bytes
SHA-256: cb2d4de2115ff3c7d8a96724a81753a3e72be8cafc5f5c4c7d3ebe8fdefd03db
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 17964 bytes
SHA-256: 436ae934703db13fa3a08ad83d54ea42f0fa30d179e10d820d9e4ec949bf27c1
font_03_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 17984 bytes
SHA-256: 231b5de10866f6a32322e1d547b923165851b9b656dab85f298e833cf19cc478

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