Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fa4da281d98fe1…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 18:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e3e69c853c73e4ccf70ca52f58c9048 SHA-1: 414a012fc416766b76d9440ae5a04f69289db787 SHA-256: 44fa4da281d98fe1be9fd9ad0119db3ce2014effc6d96358615d81727c2158a1
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of a 'password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by encrypting the actual payload. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an intent to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d437d17f4---79710425047.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/unh60rl4cbk84u3mv5f7k5bf85/74084049669.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9398ddbb686e3a1eb3e9052ebe615414/jasirisaxixeb.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/rawifi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/84b220e7e722af67cc380b05d728343d/zalorutibigitose.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/newulizurukijorukeb.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/22746992611.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/43145013682.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f919aa470cb---towapodezapoluv.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/79046768366.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/6866845622.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nesuferujoxavamizuzi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb608fc6988---gobejomavojavufiriwi.pdfIn PDF document text
    • http://eventaipei.com/upload/files/31586549293.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3ef09120---20197538263.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161104db2a9d38---50543771784.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117783ed015a---79079503699.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/dotemerolazitarig.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/29472754901.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609855d3e2bc0---gomijuxasutevekirodurozor.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/nojadavade.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/13236478505.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f53c313---xozosutitexudegimujopeji.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/vixipipiber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=element+3d+license+file+2020PDF 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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 20360 bytes
SHA-256: a9ccb66ba7d921d871bc8aa857f4c35e911a3706ba613edeab15e375d1e9b6f0
font_01_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10652 bytes
SHA-256: ed3f61e0503e16d87c9ce47b272b270d84c72b06f1c0b2dce4df59bd7f2d975d

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