Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc4b7267d6bb08d…

MALICIOUS

PDF

79.7 KB Created: 2021-08-27 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb67c213834baac278acfa1901fa2d5b SHA-1: 0f3f8f69905c9640938be7c97a474ea03d0efa4c SHA-256: 1dc4b7267d6bb08d8e786d26d0ded56735e4b3336766dda798fc147e425502c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sieuthimaytinhcu.vn/upload/files/rukuvapagukamozawut.pdf In PDF document text
    • http://learningkey.org/userfiles/wapakufagaxavedijizoneze.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c1d7e23e2600b2cdd9f70781f07735e7/nelogudo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809d6046dde---15360966864.pdfIn PDF document text
    • http://huefpdf.org/upload/file/woxidozuj.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tusopefotedimazar.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-23-11-34-29-1iGbnlxS.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/12820357580.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/dujajaselunovi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/89417438382.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e422a5bfa---tuduxenidanufa.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/demifuvozerutategomowozor.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/47784392128.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/vepukivube.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/na133op0grv1eai9sg9cdlnbcn/12346384129.pdfIn PDF document text
    • https://maturana.cl/upload/file/30029580706.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/955006810.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210822/file/16295883072209.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/hmnjpajboagcfro00kk0bv3d73/16877106783.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lord+of+the+rings+fellowship+of+the+ring+watch+freePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/035bde5bccb34e0aa8bd603b6b438354/tewunudus.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 16964 bytes
SHA-256: cca7e756d7a3b2a32ad90abc0f98102b0f7c9b85784236277c30ad485ecf9453
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10940 bytes
SHA-256: 439678a97ed35e6990af4082ec651d8e8806ea254791c008de87a3a3af60e369

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