Malicious PDF — malware analysis report

Static analysis result for SHA-256 557b8c8501e0bd17…

MALICIOUS

PDF

107.7 KB Created: 2021-07-18 02:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 17f82982e9acfc28172677d609a0dbab SHA-1: 3ef3ef8ea71773f22808020d6852e2060e57aac4 SHA-256: 557b8c8501e0bd17b610d64a1730d35f53b6d3565813c46af48a4a4414cf1673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

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://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/b9f032d04a04bead7f80399b168b0069/21656598388.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bfb8778f1d9---kowefoganetolajufako.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/27133924617.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/50131967478.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c475a5a4---32224938208.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a372d46b5---monavaliko.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/sijel.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/befozejexamomojubesiki.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/varokawomojodab.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/66471920879.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6bccee9d---fudinage.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/72be3d656c107e54bfbc39e856edb60b/nitesowimukojixuxirov.pdfIn PDF document text
    • http://wirheiraten.de/images/file/36181578995.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/27l4sr0j06cfenoir53vmq1ie4/62311602574.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5d7f3541---firovowemufugokofabup.pdfIn PDF document text
    • http://dnepropress.net/files/file/48236607687.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/57496388152.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/69016bdb55488136bb82cb685d8b9fcd/difusabobijasix.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/39d79bcf26c4921352af112a5655bf76/bawofozadumisuzilugus.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4cf55966---68292342418.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609230b4dc86f---79386266427.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tixozi.pdfIn PDF document text
    • http://446888.top/userfiles/file/8583425199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fear+of+cottonPDF 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_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF1 17624 bytes
SHA-256: 70019e4a46aa7aa823593753bb680f6b40848014ff5ce19c5bb6dfcf93fbb6ec
font_02_sfnt_off00018bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCE 10000 bytes
SHA-256: 1a2ceb774a4da5fe99532efa80f2d6e9ebff91604d3b180fc0d6b958db1f3072