Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62b9cac5e602ed2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 00:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7cd5c1b9271fc39e9b816e1f85e8807 SHA-1: ee90a0e02c6ddefdc6cc7e24a0b23284321898d0 SHA-256: e62b9cac5e602ed20a3deffc121023a0552abf5c04994b7b38b4a0a451e4ede3
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions and execute arbitrary code. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, likely serving as download locations for secondary payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://cructi.ru/uplcv?utm_term=recover+deleted+chrome+downloads+android PDF link annotation
    • http://capital96.com/userfiles/file/28112942219.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614258d474f65---79486527434.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dukosofopadijuk.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/kugap.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/mureviziwulomadotora.pdfIn PDF document text
    • http://santehnika34.ru/images/file/69420920979.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20913659392.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/23055043624.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/680790656063f32f88abb10f7c9f43df/wabakawafitepumiwew.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/44302058971.pdfIn PDF document text
    • https://invest.pl/userfiles/file/lefosopakemu.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/99431910905.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/lawelenepuna.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091400011221.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/66cc126ef0a4e3f4f27100cbdea7c628/pixekamoxunozusex.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/bujewado.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/razatobuzafalifivut.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/27689213054.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/23724750535.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/92128533549.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/dorudazuzirepoturejadoset.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7f4cc644---verir.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/bexibewogoferev.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/vobusogewudajigifiropan.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/32842057373.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbfd28b86---jitupigamej.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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 18172 bytes
SHA-256: ea5e1db8293b0bc4321c607d7f46fbcedd2e51f50f17c435c06b9d61ebddfd53
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 10832 bytes
SHA-256: ee0013f9feb0dfea8091d57787fb1903a6a931f9f7c2adcbc87a50fb430cc88c

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