Malicious PDF — malware analysis report

Static analysis result for SHA-256 c724400ac12a030e…

MALICIOUS

PDF

101.8 KB Created: 2021-08-02 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 577652a6d1d6958e14af3c964b827502 SHA-1: c52372ed52b78c1a03c4851064029f393a9c0453 SHA-256: c724400ac12a030e62fd47afbcc6284ddf48fbb438942d3a9ea5fe40ce9d3e77
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, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/45a3cf213b94b5f1b4911c988d95941a/tepedasanavota.pdf In PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd8f8ab08---55731214792.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/af4tlvo86pe8o4f7ggd0abso4f/vamukugevororigasojeten.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16081af2c4e0ba---11318860103.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e14ce13ae942fd20bc89de662d0e0387/pesadifusi.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/jusogakum.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/53472652164.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e10f77488---rorajodi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/50455247281.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///2439860915.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4dbd0acf---27966989870.pdfIn PDF document text
    • http://asfalon.com/__files/file/sezakawanusinajodavojikus.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/magikigeganazifemowu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e35e144a4---lesedonilajifuwodibugele.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/bbdbcaf7b9c6d260a0a8c691fd1838af/jagovefikefefadekezipim.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210728075403_1298450743.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/52173305194.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/42918198173.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/a20c0c6fdd43a6acd728b0c16457a804/puwojawopesobov.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8pgi9atuef90tjtvb58avvgpv8/tatulizifidutowexanaf.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b6e6388040fe7b4ffd893f82622bc00d/6874698668.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/xiwolinuveno.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/konaseluxuzi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/33553148705.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/29115072441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modelo+de+liderazgo+situacional+de+hersey+y+blanchardPDF link annotation
    • 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_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 11056 bytes
SHA-256: 5928478de2bd3c6ef0bfbd3163ba306c2140d630af41c575469642f3757c128f
font_01_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E0 17916 bytes
SHA-256: 7a5dee34246100786e5a2c3837bc6e16979162fbb48ffd3cd5241306cd538868

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