Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8dceea04e1e18c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 06:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c772f77732e59e29c84c7a5f070c9e28 SHA-1: b558b6ae4d22e2a939354a375fec8d57499ab924 SHA-256: 8b8dceea04e1e18ca71fbcae865904e32a94ac914fafb5e97966c639aab29e71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://tw-jia.com/uploads/files/202109160004451217.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1bfd5dc1---tawibunejojuxepura.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/suvakenularevekotofudido.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zositidojo.pdfIn PDF document text
    • https://castel.ro/userfiles/file/23712247026.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161477bb14d9a6---janonuwijem.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/86881412921.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/janasiralepele.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xapuzixugabununesel.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/tiwip.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/gafirofo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kiroredowef.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021932014355364.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/80967330251.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210919_222535.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vatoxomiwodetazitepok.pdfIn PDF document text
    • http://opsir.eu/files/file/gixagib.pdfIn PDF document text
    • http://prestopc.it/upload/file/zevasikirofivipo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/89665720945.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/juzelajiniroxodepi.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/jexexi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca02c00037---53021643042.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/13999729758.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/32264159440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+realistic+apk+downloadPDF 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://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_off0000bf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5C 16408 bytes
SHA-256: 9ee6dda8df706335b26d546fb344c00846cb4fde3a0b6a8724d74285278a8058
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10784 bytes
SHA-256: 367a9321d69965c1b2529c1f80fe56b4e7070100febdf5c78a6df60a0ccb9d43
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1