Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62f0e6ee8424b20…

MALICIOUS

PDF

108.8 KB Created: 2021-05-17 09:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b471e8ef249d7aceef1154edf71db3f SHA-1: 5ecbcf753390e340cdbcc40f2e316b85eee63a00 SHA-256: b62f0e6ee8424b207d4309c0a967582376dc592796a37a42bb01cdaa81584ab6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by 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 0.9996

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=cronbach+alpha+excel PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fd233ad45d---44397767374.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4b4e59d9---6041931468.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j0ifc3tjeu565rnbo8n76tbn5l/25706049298.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ldhr5oohsia5ahn88qgkjoi7r4/rizijokebi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q1p04t96s7maq1t7011llojke3/nenel.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1177ce37e---gupunanuwezonegivifimeg.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/81751045392.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/62063606891.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4f52a080---sagupuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/71386555108.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0d03qratcbtliav5tn2pfk9br2/besosef.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7abseg2r6glu9bl7hkrl4aob1s/76910100191.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/nivazosijogidofanada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 4736 bytes
SHA-256: 5084fb6a686356af9b48aeb5d234435a1c2ad53d4d5bd32c97196707486e8405
font_01_sfnt_off00015289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15289 14212 bytes
SHA-256: b730559082b9db2f76c7a55c84b5d0bcb473b2862659c90fe5d9d699a5896683
font_02_sfnt_off000182a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A1 16180 bytes
SHA-256: 878a814a63d6c9f5f21039790d2a198091f00bb031f2600b3ead42b3b383b4b8
font_03_sfnt_off000197c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e