Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98bf2cdfd578af5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 12:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d6b33723e4202e07b6d74630349b152 SHA-1: 66a43d65d22e70c6b1f781f91a038569c567018c SHA-256: a98bf2cdfd578af58b52205444c457c5fb9e2694a9c98ee02fbea880747ca8a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://espressobuilders.com/app/webroot/files/userfiles/files/59353686111.pdf In PDF document text
    • http://glavis.biz/userfiles/file/tifanabebo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910183201.pdfIn PDF document text
    • https://kawanmto.net/contents/files/90741378206.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/85230783368.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/73941986762.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a3c3cb7---kuxovak.pdfIn PDF document text
    • http://freestyler.cz/img/file/6049305298.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/71161712869.pdfIn PDF document text
    • https://limsurempat.com/contents/files/wasapar.pdfIn PDF document text
    • http://ukrfirework.com/images/file/86373596447.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/38713052757.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6703a9bc---mesiturevaxipisamuxolepo.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/ralijosopuwevazelesep.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/feluxus.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/96393593065.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3rogau8ukc0k2nakbdhuiip4h/46136473062.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/botedotokefoseji.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/rexapasetuwadalasufemur.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/purogotowixetomegasefuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f50e9e4f7---63953548167.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132e54947623---fazebupometokebajexo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614476b29999b---42350718458.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/9374854871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=d+company+full+movie+free+download+mp4PDF 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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 10960 bytes
SHA-256: 426ede4a6bd680c478212a666e8e4a1cf2b5e59b88e730ed15a6cb9a4b837c3c
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 17352 bytes
SHA-256: 506a2a32911137c3f50a528684a21659259d9133b6ede66b3745628bbe910e67

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