Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1d333278cf9540…

MALICIOUS

PDF

86.1 KB Created: 2021-08-10 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6442f16acc4106679ed6ff249b95f7b2 SHA-1: 667745e0f895fcabb81e48aeb0071388e3925fdf SHA-256: df1d333278cf9540e4ad8601704af6ef0f12f6d2fadd758f486c3158921a3d40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allseasonsart.com/uploads/fck_uploads/file/63176120214.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5df776055ce508df8d5fc764f60b3af2/latunitob.pdfIn PDF document text
    • http://jcpingie.be/public/files/98248510576.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607623795c00d---2271399219.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aaca9e580---virutix.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/xufotoj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d60b553102d---80997518513.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/surapugeso.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wibuda.pdfIn PDF document text
    • http://myphamasia.net/upload/files/saxubegapepu.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/46578067316.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210804_1E69E91B0AD83A22.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ef1daad29800717b8a6bad0c846575c/fowazedalatokubilata.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/mugiku.pdfIn PDF document text
    • http://moraure.net/js/ckfinder/userfiles/files/moxaxigarorixaluvonakofex.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/pomuvowewuxesasume.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jutaxa.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9cb7a5c3bc4f2320889a7e5eb379cfd4/magudidafedogagav.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe232fc8c11---41073431289.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u7ra6o5vjqfg6u28i6url23euf/jofefowerexafibelojoru.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/16823460003.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8299ceaf90---87286825554.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/solop.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7o117d719nblt74sb4o447dap4/4691733225.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/63f6d9dd51ed224cba1bbea203599c37/90845143851.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8af39be99e---bavugerilan.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/76983413924.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/041dca7f4b754a8d67cd3eab2515ab9d/vuvefibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=romeo+and+juliet+act+3+quiz+answer+keyPDF 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_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 11476 bytes
SHA-256: 79976fd400ad359b20c7ae3ab3a13b96b85c0c8bee5a4fa8cfbf1e488d6797f4
font_01_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 17048 bytes
SHA-256: 88e1b5ed95ad1b8a91b04edfea3a6c37aecaf3d22b7e87ca8f2899da7ad700c2
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1