Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98e123a7a836d61…

MALICIOUS

PDF

98.3 KB Created: 2021-09-01 21:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d595b5de4cdc2a5183acfcc879753f29 SHA-1: 45b38cf03f328ac1c722c1a501f8e4e540fbf17e SHA-256: f98e123a7a836d611747e150f1ee03297d1617ae03b2c5a1178a7628511808c2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://sevenseahotel.com/uploads/images/files/97778401792.pdf In PDF document text
    • https://hinodanang.com/uploads/image/files/laferopoko.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/10207369855.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/25342076383.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/rofejukapadopa.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/dobeso.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b456a1401---13383174127.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ebccc46ab---bupukakikagamali.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/63908802596.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/84518149915.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8il1429thhls0qlvf0husb6u1n/81767394324.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c580193d---tawuvofufek.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ca9e34df595962837c859eed611e13eb/94852244361.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bb7b6e19---nebavi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/407458953bab585341453d2cc45dfe8f/25529943254.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/lutuxudedepavulu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/japiwogiwadabadavefije.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0t0lc5qf4m1im89irlfo42co83/43462285869.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/012147162767.pdfIn PDF document text
    • https://etadelloro.it/images/file/bomilebarozexusumogiwa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de23b32acec---36770776688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=haskell+bitwise+andPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/079f869aabfd481104cd728ef788ddc9/wotawoliboxusigijuve.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_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 10332 bytes
SHA-256: 9d5a1b0f27285d88290ff2e5bdc1c3e733be7fcc4cb79d04f649bb9febf793f8
font_01_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14794 19416 bytes
SHA-256: 41006b87e456e7edf14cceb72d6e25e83bc3a140e7e2a8a8177a68cc72fc4d46

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