Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef700d784aca1c70…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 09:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 574290c3c0c94a737f0f048f9e73a2ef SHA-1: 8e27ca298a469700161a44aef89c838853832792 SHA-256: ef700d784aca1c707fd234ef2ef0713adae64c23ed3acad4e97fa44fb90cc1d5
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic specifically points to 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. The numerous embedded URLs, many pointing to compromised or disposable hosting, suggest a link farm designed to redirect users to malicious content or download further stages. No scripts were extracted, but the overall pattern suggests a downloader or phishing lure.

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
  • 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://synerhu.ru/uplcv?utm_term=movis+for+you+apk PDF link annotation
    • http://dok-vo.ru/userfiles/file/51656839380.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zitujavisewix.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/kudirevevo.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/89627904521.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/50518788004.pdfIn PDF document text
    • http://potlista.com/file/files/74533224328.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jelagemo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/64d5da5f07ff8f97bb822745fce662b9/40603249745.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/70301783143.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/24263424896.pdfIn PDF document text
    • http://generaldistco.com/images/file/38707002095.pdfIn PDF document text
    • https://moolans.com/uploads/files/21812688484.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161392131f20fb---nunefetiduv.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e902adcfac3c116ce32d8def136fd4a4/nezejogezobemumowuga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110057b78a---kujifaramirive.pdfIn PDF document text
    • https://finliz.lt/i/File/wusaxavupopinez.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5jjo1kutg0kt7vg5nnkr9j36s9/rafig.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/29028438784.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/7308737538.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f52cb9ef---58397133203.pdfIn PDF document text
    • https://fishboat.hr/files/sanixedaja.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/90023701621.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415173dfe4a---xejov.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/84845083584.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/funak.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10336 bytes
SHA-256: ca388c72febd34b1eb16010cc6e49578b93abf6c9f833169c0a99604e585af41
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 19004 bytes
SHA-256: 7161a6ead2236048140e85d228a092bbef59bca59736063702a0eb86bb32453e
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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