Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d1a9606e39ee83…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 04:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1d3d5daabcb3d07ae026fdb5465891f SHA-1: bdb777c5b635130e445ccd2597c1bb8f4710d89c SHA-256: 77d1a9606e39ee8384439ea7f59ccb08027972193efe7bd374d17270fc57294e
136 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document instructs users to execute commands directly, likely to bypass security measures. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack designed to trick the user into running malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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://drafthe.ru/uplcv?utm_term=how+to+get+rid+of+safe+mode+on+phone PDF link annotation
    • https://brtim.com/uploads/wysiwyg/files/74807580176.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/37336809872.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/42659944835.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/xevuz.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/87590978977.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136546a0510e---fowon.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/24358803724.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/winewuwaratudutuxur.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142542af1a8f---tusugiwuvusulafelujuwoz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136daf2b6126---55470546398.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901114550.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/bejinulazer.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-9/20210909235917861275.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/49008387685.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/kupatam.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/rulifomavakuravazadejosem.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/gewirit.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_D7C05279910D3EF4.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/witabimitejepasidigegox.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/n0upbjl594jt3kdfphdlsu4ck6/xuxeriwefaligo.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/bufawugifaruk.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/kakekomup.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 10976 bytes
SHA-256: a0a7aa27028b90bfdb97a065759b81bd295a14d970f8421f4d9362053a4a4835
font_01_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 17588 bytes
SHA-256: e33f22fe16ee99792ec6658e1e7233cf225633ddf9cc3fe8c9098662f0f05a72

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