Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c534b7a0e9cd1e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 20:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eabec745ad43c3984d2d76c81c7cdbff SHA-1: b8d30f2cf4b1bef37c385495a808d97b6abf64c9 SHA-256: d4c534b7a0e9cd1ec1719058795b45d7c745f8d9ab8373bfb63087e44a5d68e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to PDF link farms and a download button lure suggests a phishing or social engineering attack. The embedded URLs point to compromised websites, likely serving as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=messages+lite+apk PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a528506601---28889479920.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/wowabiwuwupasisajaxegum.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/27557833465.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/60291069064.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/ruzugivera.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/xoriguxokutevivepipugol.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/67038188107.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f811abe658---xonibewugupifiwuboxobelo.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/74859451664.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/joraneliganugikigavato.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/79941965060.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xiwabewiroloxuv.pdfIn PDF document text
    • http://spiregene.com/image/files/20210901_182306.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/26003107278.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zogosorifok.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/22079119880.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b6d94a88880968b22396f42145e2d4c3/makepiteji.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///61140908812.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/397196181.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/57408672746.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/70361723105.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/tadapizugetigadusizegi.pdfIn PDF document text
    • http://poultech.net/d/files/wedanepowasimakitas.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/sasidugubi.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 10188 bytes
SHA-256: 7aa89be81c82d0a9f4dff44c9b862ffc35bde5e0b91b2bb8735f73a2783ee14a
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 21920 bytes
SHA-256: e13d07fe8f411247bc6a5d70e1bfc89be2591980246a1486bc9351eea1e0b6dc

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