Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c78b6ca02ce0d5…

MALICIOUS

PDF

95.0 KB Created: 2021-07-26 21:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2e4e5eb728b9abea50ba0d371ae25e1d SHA-1: 2041d27655bf77b92392afc40d57f7d3345b127e SHA-256: 55c78b6ca02ce0d5f4930b504762c880e00f269a3a85414d722a97b90332ac94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842a511933c---duxigesowugikaravuzuloz.pdf In PDF document text
    • http://greenhousehotel.vn/uploads/image/files/rigarusigiteta.pdfIn PDF document text
    • https://digireg.cn/upload/84168097151.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/alrp1gb9ce78h97hskp7mv5bef/94735053396.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0ov99itgf591gh1erclh5jbcm6/51396044113.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7sjbt1n52j93rjrt1v12tfrcfn/76420615852.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/35897010274.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/kepesodiwete.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/xuranekomilitimujupepage.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/71062219047.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b558e50f9---71150598408.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6961018b---zevuwiwe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4a597524---6681317441.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430002303516831.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/40776689064.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tcethetj20bbpkvsbi9rrqnila/jojevodonizopi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8m70dlur3erlap8apj3a9vpi15/pisazuvi.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tufoxagopesosamoravud.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f2c2aee345b89a7e8b8fb79c5364af6d/jazezawugevozora.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f978e086ce---figusupumasuzabomitu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dp+animation+maker+crack+free+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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10792 bytes
SHA-256: bafd5d701f47f2f8cbeec5097c9640b19b80aad7712901c8eb20517ee81e96ba
font_01_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 17612 bytes
SHA-256: df4c8728fa388e3bcd42c7db1e111bd0f3b26de8a7c69a2abe8697561ed6148e
font_02_sfnt_off00013e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E40 16832 bytes
SHA-256: 787d9c22bceae670bff35031c926367f382038c4dd3daf232c30b7bb39339910
font_03_sfnt_off000155db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1