Malicious PDF — malware analysis report

Static analysis result for SHA-256 800eef23caf59c68…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 20:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a8ed289968467727bb54835c27bdf5d SHA-1: 28cc93d0ee2d6a53bdb591cfedbfc99fe3edf21f SHA-256: 800eef23caf59c680b2daf4bfff6a95b91f86fd2b716e0f7732fe77f7914bba3
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms or are part of link farms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=android+emulator+free+fire PDF link annotation
    • https://elsadaulte.com/ckfinder/userfiles/files/rufamimifowemoj.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/77919305145.pdfIn PDF document text
    • http://air-con.ru/upload/files/kenisowajovut.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/10223924186.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd39c6346---60336673643.pdfIn PDF document text
    • http://silver1979.com/upload/file/90524023573.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/knh2hdv34ifc4bhfhh43l61mub/45965948192.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fiwuxufubugiralurelomet.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xabami.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/bibolemuvig.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/runupefowikowidawilezam.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/boxezinaxasonuza.pdfIn PDF document text
    • http://julianina.de/upload/file/xenulibugelazuw.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/4190112999.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/449b0bbac06e055c415ebbd7650acc26/38211536785.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/72461279846.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/musigewopapivoreduwig.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/sifobomasifogegawesofejik.pdfIn PDF document text
    • http://strandedtattoo.net/file/fuwebikozadikodimafe.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/goxanoxalazavadepilo.pdfIn PDF document text
    • http://mcutech.net/files/rogewuwixogizeni.pdfIn PDF document text
    • http://rapet.hu/files/jorozusezajenuwugivuso.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/99682511916.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 10428 bytes
SHA-256: ccd195b2005fb1f709d1545d44105620d0424ed1ce801bf6f3aaeda93dc05a70
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 18748 bytes
SHA-256: d67cdf44f522e493dec21727db41687725f9239e3717f5c235b8235a5c9e92be

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