Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5dd2bfb767117c…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 19:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: afc2070909e5db4e86dcc53ea2668b8e SHA-1: 2f20c8b14a53320183dc8599f3dadefd3606b6a5 SHA-256: 8b5dd2bfb767117cae5520e41e8b38f95180e0aade011a07402619975e8ee0a8
196 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The heuristic firings indicate a link farm strategy, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=watch+wanted+salman+khan+movie+online PDF link annotation
    • http://kapelski.pl/userfiles/file/65136871587.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/boparabadazoxapegivu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/99055442662.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/f7nd1ef8cusnibj7vtqbc070c5/24128182711.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zejupufixupunapixekibaf.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c5ahud7vbbvakq3n194mnbg976/titezasur.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac6f0e533---72290006991.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/73055373636.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/84673778524.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1aaa00f9---xajutirapu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/82435284843.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e120fb672fc31216b137e3f20df5923d/29381214615.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/75725843067.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2b97e1c0---zunugorel.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3da67d3d589568b64c376551e55a398d/15767615408.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/7091307957.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6112d9b99ac207959dcd76d4831a4622/35733530058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5312 bytes
SHA-256: aa5e89eb90d91c67f20e384509a2a745fe0918ed18498f839bbf09592cd1c7fc
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 11012 bytes
SHA-256: 1ed8bfa05c54e9494bfc07164ccdc8dcd157b895ecc94a99ada06aaf48b2a2ff