Malicious PDF — malware analysis report

Static analysis result for SHA-256 a947a0aeec0af559…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 07:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f24849aa288f6c1cb49eef5cfaae5a16 SHA-1: 9975854ab55c0122a572f2d2f84be533fd5f332c SHA-256: a947a0aeec0af5591308c1763bd00578cdae84d40e504bf5fcdfca5fc233475e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9827aa0873---pekesexomakopemir.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9a9baed65e3e4de725b9b4fce9d8962a/81201645311.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/f73io186dvkbekagalb2o6tfur/kexijodulapudukewugaxuji.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/vobezetofomagej.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087842015650---mesigagefi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/xisejegutefuzegolor.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/8967448955.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/88271140616.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/xerakilaxizigog.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d05b8ae57e78d27fdf39c9d3302bf708/63574053727.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/povasilizizorumafizo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f810a0e5f---66533356223.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91129913455.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/gurepi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ec591284c879709dd1d7d148c9710798/15141711192.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f91a8ccf3---nokivilanememupotejig.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
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=learn+objective+c+on+the+mac+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 3440 bytes
SHA-256: 0dcd7e48dcd29f32205f9d299a166fa81a778a49412a63376a03ab8cfd3eed7b
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 5188 bytes
SHA-256: 0cd0157b84d928f1251b8652dd13f342d698c400cbbc21c5c996061ff721a6bf
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 11308 bytes
SHA-256: a9aec9face9409144ed99fb0ffefc0c2d184515b51d7cf0aecd9c746c9d434b6
font_03_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e