Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd88bf7ab480346d…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 864b030f7d10a0cde0eb55fdc487557f SHA-1: 9fc62e857b4133574fe9bedab579e663cf3b4326 SHA-256: dd88bf7ab480346d2c0c6eb66b2d1be6cd2bdec645831992b00f3400d8350310
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ost-fogging.com/upload/files/49134283764.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94464d0de---38680646933.pdf
    • http://huile-de-nigelle.info/userfiles/file/neteloxabatogezafijizikuz.pdf
    • http://jar-ted.pl/file/pugozijorufupiwawuku.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3fb2ce78---fidavudunaw.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nv4o4t5kaugpio2h6sjac51tv9/16079395304.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ff5768c13401c356e5180a04c858df3a/dimegosobu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088df0419a43---vujosisevo.pdf
    • https://beautyyaurient.com/editor_upload/file/newinigemosubaki.pdf
    • http://ahchala.com/img/file/22803035706.pdf
    • http://gallery4walls.com/upload/editer/file/tikemunubewuxi.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780afa27fb0---kulupuzenop.pdf
    • http://dok-vo.ru/userfiles/file/33901147208.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae950c474---gazefoxunegofanoxeb.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2d7e41d330042bf8fce41b3561cfb6d6/sexijane.pdf
    • http://ankamet.com/userfiles/file/dawawefob.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6abcec3567410755209ef0e21051037a/3618386203.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/qdol5e0icbsbom7vcki5do5b74/26293021853.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6b92cc78da60bd86eed7736aea8088c1/30791135201.pdf
    • https://alakharia.com/public_html/userfiles/file/disonuzokig.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qfuk92d98nkbn0scldqkuqehqj/rorefikanigufumomozutezo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759e6bd737f---disoxup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+coloring+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e616.bin
73b5e93df6270772dbc1b8a0abdf94374370c6ad2633509156105ab9c07e1714
pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10884 bytes
font_01_sfnt_off0000fec4.bin
80d1b24cc41c0f35449c01808f5962a7fafa1ca342f8d6cd11b586444ff7e432
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16492 bytes
font_02_sfnt_off000129a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 16792 bytes