Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca82af4495be751…

MALICIOUS

PDF

90.4 KB Created: 2021-07-19 22:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d584eea280402f927a72559a00b46ed5 SHA-1: 5ff7351c13048336adc1b27c587ff541362a0a22 SHA-256: bca82af4495be751689d164ecf0812a01a19af7b3bfde6aee21ded7b031ff19b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to evade detection and reach a wider audience.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3g1nmfvg62pf32bg031ffhejer/3098124845.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088f74bca0c5---rixutasesesa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/31698404759.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/resal.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0dc8f1d28---57697671615.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8043a69471---bokaxisamotosilewezuf.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/xikunawunusezorokudew.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210520054205.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/jonugelu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607319dfbb0fc---divamofidulifejalelutere.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xalimedusa.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/babexedoresemukotate.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ajan35mi86ol81t87frr3i9hi1/26544060951.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/53e6ac80dfab7ac5bd78a0b0e85fed5c/sajawifagagon.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/uir7uhba2bn853p1bbnttdrgng/muzofetalojamo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/gubifatitiw.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/36783548189.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/db916363e5256de024d9ff028d6c93f8/witugatuxekeg.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dodabozagow.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/35343146678.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/17313996408.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a12f65d22382b2598bbdc9d1825bc6a8/35374209014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=no+more+slave+to+fearPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cc9e4ee0d0644fbf34cf3616a18b77f4/mibimuraj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10220 bytes
SHA-256: b32a22d4c3bbc1d50743040aede77788f429df8810328f01da5a3ca984acc4fd
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 17248 bytes
SHA-256: 54912c89446600c4f4f394648f4a18eaaf62d38714619187523bc95c4dc6d33b
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD9 1876 bytes
SHA-256: 3f4a116b07ddc995ff348222cd86b0600369289a50c830baef7afd72150f8b04
font_04_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16416 bytes
SHA-256: a53189842a2c239d1eefc53d229ebe5a0322e18bd716236f3ed49f3077a8a441

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