Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd2888e584b7080…

MALICIOUS

PDF

82.3 KB Created: 2021-05-13 18:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6c0927b3a3e3151e6ce1378341d46bb0 SHA-1: 1942ee1854aa67d6ccf20af036f9135432221e53 SHA-256: 5dd2888e584b70805d35f8aad91302a7a83f10f7549e4a9b1b33152e98d9e74a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically identified as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d91uqdsbiem897u6j41p5qc1u2/14414144842.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qfp7ker99eb5vu4879el5iktln/xezetisudewesovevip.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511797342c---fovozijukiwetuvak.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/151b68vtlvq2lvg7a6qj768o8b/55082452835.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df64084b60---wusekerenovafisorok.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e1d499de---3618937849.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607827ca20af0---rijapukokugataruwekaj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca33338f2---91495424454.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/75241546508.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/950cb6bd5a944342f8938ddf45d6b30f/96893582144.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/485f3c4128fb4bdda459a22cd9f81445/54661422077.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/65105244753.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tt7lhd7180nk3sj2migapc1lnp/31300955437.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/zozijinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=child+psychology+pdf+in+englishPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 5120 bytes
SHA-256: a4efa4529376c64d3fb2182bd26f489dde83383ad0ba56e041c3a20b34b565e0
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 11848 bytes
SHA-256: 12ad1d1b91ebf50e7e67023bbd9dbd4bbc357305b8a0006146bb9bdbe4ee4445