Malicious PDF — malware analysis report

Static analysis result for SHA-256 21705844cdc8c03c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 18:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f32b7e205d6fe9ebce0ff3aad070776b SHA-1: f18b43bd5cc4109d0116d9184b51610b864b5c5e SHA-256: 21705844cdc8c03c8a2a4d2ca24dc3dac4c7d8133361fb9512586541fac19c92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The PDF structure and embedded links suggest an attempt to disguise malicious activity within seemingly legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=anthropometry+procedures+manual+nhanes PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc1af1609---61800733872.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0i7mbbl0mdbl5hl9fgoarfhmsg/43330894778.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a085e96a4---23313152540.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a2d3f433857a25b1ff67103121beef68/sewewarufuvozebose.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/4355878656.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ta604ebpvfd6376ja854lbcbca/bifadulisorolajepixibusi.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/89220332031.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/gokobimejo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/89065820926.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/32864321306.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/figufexopujexebijunop.pdfIn PDF document text
    • http://eko-uklid.com/files/file/31148981113.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba217ce19b1---53342351698.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c91vretkippm2vh9ds02sefmvc/78923364654.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fnbspv4p436u5u4g23fn2dshas/41034557801.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4ffa7285022f45a412942943dcc50296/nedozuzoxofafiwelusetoso.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c674f8897c2---bakumaz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pqokpcgu2gli1psvmc3k35ig2/disiwegatitumitezimuruvus.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/fipapugoxodixilebidomeviz.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3ab37e591117fd114f111e81bdd76bd2/72770240719.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/25256557560.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/33241585662.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/66546003388.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nsvl9mm2an84sk00tr26q44gpm/jojapawakijawar.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10884 bytes
SHA-256: ae7f084f953e8aa2e1ecd41e93cdc2da1b40db63e7c7dc1ba677f70129bef5dd
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 19920 bytes
SHA-256: 09d8d72c84c5daaa8d8a4718bcf62297c1c09cee8b404dee5779b765fd19eb3a

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