Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddff655bc5b0dd4…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 18:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 519dba9951ada28ce02f0c153b29e171 SHA-1: 88475280d854b6f52af1f741e778a09569ae31c4 SHA-256: bddff655bc5b0dd4abca8aa916e8ec7380157d509d5bcc2bfec8a149575b5baa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+to+ss+on+an+android PDF link annotation
    • https://ww150002.linebot.net/upfile/files/20210924194828.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/womogedorarupagikekevatu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210912232513.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/xuresoguzed.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tolopepapamaxefuv.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402408b0bb6---sizezizufizanuf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613450eab13f0---midutibudixanukudedev.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/58272352585.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/disof.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/kavis.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/38635381324.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/12641784011.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614980c51b5d0---22243239878.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/vimesexivazipexoliwaf.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/zozunenidovavitemi.pdfIn PDF document text
    • http://goldia.cz/data/file/wefusatafajapododukawes.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/45324901933.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/90470938892.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/18048392215.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9pldhj0hgj9mbrti2jlrb59u41/penojagatetimolawonoj.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/15760159325.pdfIn PDF document text
    • https://endobible.com/userfiles/file/55679878542.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/buwot.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/nadujitajitimobal.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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 10140 bytes
SHA-256: f97a4d54f72d74f95fcb169ede5ed4baa25d105e555d3bd3cc230473022b1369
font_01_sfnt_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16628 bytes
SHA-256: f83ce61ec73dab797f2e7c66549bd1b70be01e2b65c8b8baadd347ff5ae47663