Malicious PDF — malware analysis report

Static analysis result for SHA-256 633b2f7b40c4c37b…

MALICIOUS

PDF

95.4 KB Created: 2021-08-13 19:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8549936b269b9d7e3ab8ea6bf2fa28b9 SHA-1: fa9f8138c2af971685a8a3907b87f3b6d3767e44 SHA-256: 633b2f7b40c4c37b863e82957b6470e54fb807272a4b52599f1f4aafccd99159
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam lure. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://gpe-el.pro/ckfinder/userfiles/files/83552294947.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115b7fe6fa51---dakem.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160704946c731b---53794316057.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b85e9945---jepoziredaboneje.pdf
    • http://balade-pierry.fr/userfiles/file/50079682584.pdf
    • http://msiutilities.biz/documents/gevobamufuz.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61da63a544---54257096953.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8c50a9f0f0659747a9ac33183f9a5d69/45103669239.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8f458ded---46096937176.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/51164965062.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/finasumobomokoxu.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/98b3b40a5abe0955fec31020edd3b78e/3363052266.pdf
    • http://nonstopsushi.com/uploads/files/86961151069.pdf
    • http://libron.pl/fckupload/assets/file/58959505510.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/zimegeda.pdf
    • https://memoservicesrl.it/file/viwesusexepaduvo.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c32fd67d3---fexuwosorijisif.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd81beb09---jujezajulevikosadidezomib.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8ldq5ul0tdu81tnunub9eq85p0/62763157948.pdf
    • https://mimpisiluman.com/contents//files/temefejatape.pdf
    • http://dolphinkorea.com/files/files/32806068702.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae00bd7bb2---30611615828.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3f1828cfeb32ccadf4da4dcaa20ea5ac/70427638841.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c37ecdf136f74a5bf27666e6f95c39e9/45356792652.pdf
    • https://tekartltd.com/upload/files/kolebir.pdf
    • https://cissud.com/uploads/ck_editor/files/bowuletoxomofetapat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+kenmore+grill+model+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011156.bin
c5dd6b12e406b0b0514daec7bb04bd1489e02f0fcd31238a02e65315a06bf0ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10776 bytes
font_01_sfnt_off000129de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
font_02_sfnt_off000141f0.bin
6ce435a6e974478097edbf7a88ee9cf94ee758e6867d8f3def44618ce782b51f
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F0 17212 bytes