Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b23758e9b8895a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 16:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e549ca2636eacd6782d72af21ecd519 SHA-1: f0bac12a80ec76a74adae1495ae2692c9befbfa4 SHA-256: e0b23758e9b8895a39716c1a0eb0f66ad70ef0aaf3a1c5826de3f4af00005436
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of redirecting users to potentially malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest an intent to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=jigsaw+2017+online PDF link annotation
    • https://mmeasar.com/mmeasarfiles/file/17901030616.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/japonojafetopez.pdfIn PDF document text
    • http://tianfonmm.com/d/files/rowexor.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57292951017.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/zufufak.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/1649070314.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/74677809551.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/famufenofixikub.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nopeduliki.pdfIn PDF document text
    • https://ratodua.com/contents/files/pipunevimujexavapifujag.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/25917364111.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/21842402425.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/zinexuxasubitamo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/27699771001.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0c0cedf1---didara.pdfPDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/wiposu.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/parorowo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5349c6378---niwukibenuguwegag.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xoxiwafi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396b0c4e26f---fukasenera.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xusetapevagusujulokise.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/70994514371.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r4lv9qit5j6plmllofj1kia2r5/11305451037.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/dapitisajoma.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/66166076766.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10508 bytes
SHA-256: f58433224fa25a3e2f48f89b06f52c172531c63d370ff7a16dd352cfe9e762a0
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 17992 bytes
SHA-256: d7c078a71a36100abf935d07c2e83c75580a6b5a3693d2de0139fac9ee517492
font_02_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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