Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23e03b1ba5030bf…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fc2d3e78270ed756433a02dd9d465b8 SHA-1: 08e59b0583d22e0f8214b8a7075195207c075d57 SHA-256: c23e03b1ba5030bf72b881c33101bbb12d523e65c02dc496bb248ef2b4052a8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=gta+san+andreas+v1+08+apk+download PDF link annotation
    • https://ofly.om-digitalsolutions.cn/upload/files/55705240143.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/komeberudemotuwuf.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/86719201938.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5f503b19---dujekazoripigejeleta.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/29898807691.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/34880337952.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9b45e77c---bixunetepadevox.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/30194596459.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f478f913ac---jijudukokajo.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xadorebijodolumesonopal.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/85681189926.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e370aada---samapasamutox.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/65439766794.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/11387946101.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613630e00b623---61967361869.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • http://livestocktool.com/d/files/17897823905.pdfIn PDF document text
    • https://rosycaffe.com/file/fevarujitof.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/sowak.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/vojararutu.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kozumo.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/xexakufubovikat.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/37772918017.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/potebifemebadudixaze.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140300adc511---19189635312.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/07d63873f31325d2bccf1e50f9080280/rikarilajupalamekor.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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 17524 bytes
SHA-256: 8c829634b7a1ca5790f6fa1ff5032f2a9f8e6c6c7518c9f30434a0228ba0bf48
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10956 bytes
SHA-256: 0547442dfa56555fdb169e83944bb5c4b232aee0de24df78f0d76ba5c4a2d232
font_02_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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