Malicious PDF — malware analysis report

Static analysis result for SHA-256 8767a5784660642b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 13:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b732a893544a0d2ea4e60016a2a84992 SHA-1: 0ab02dfd4152e798a80d9ed5be83d0df6de55979 SHA-256: 8767a5784660642b7caf1c60d11981d5281e911be6f761220c3685090a3ad5ac
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an effort to obscure the ultimate destination or leverage compromised infrastructure. The presence of numerous external links, some with UTM parameters, reinforces the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b2767db9cedac74095a3dff2ea1c023f/61686660473.pdf In PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ruvh7qte78mj4ou7c5r0673f6m/pinuto.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/82978537256.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/romaj.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5264e0c85a---66068140523.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/117ee99dd75b4cd44101ae09e99dce24/2350901159.pdfIn PDF document text
    • http://theponghop.com/upload/files/32746696244.pdfIn PDF document text
    • https://yuss.it/file/80114758310.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ae5d3a273498af3edd9b0fbf199f6527/batuxubo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b354bd3d01a04fdc58414d8594cd4847/43709231359.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5b320d1c---51880269955.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/24080703372.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ponuru.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/683610a309b3e4a777ec2dcb8928c1b6/xazovixirazerupiresono.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a7d2f090---39995852948.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a784243e114---18212193639.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/dadafaxugegugobixuwixa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cab93e7c1---wuderipal.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2a329713---fanamokojefodolisi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jakowuduralegusibevutofu.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/rufejajage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+film+sense+sergei+eisenstein+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10992 bytes
SHA-256: 7ebecbf53c768cc981e422912e0f3faed400807a3ad024d2a375105c1f5a8e10
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 21980 bytes
SHA-256: 1b663a053adfb1823188148cf7f65ff80bb5ee332c7ff918b8055664d8a93fd9
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 16396 bytes
SHA-256: abb1c5212c7480bf28b15a10519ae854fbeb9c662d095143ba48a910f5b7d4ab

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