Malicious PDF — malware analysis report

Static analysis result for SHA-256 89524f4d780790b4…

MALICIOUS

PDF

85.6 KB Created: 2021-08-08 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f78af85a142af0719f7abc81280b0a21 SHA-1: 55f7edd9da9533c93f28a766b3f5cf144c65710c SHA-256: 89524f4d780790b45601c4e9ba9291c5356169f47045b56fb6dee3d23f525fb5
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to distribute malicious files. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern aimed at tricking users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f995af412---9265395129.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/71e70d5bfef465091c294f49d39d68d2/66778135961.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/lifavosipigojizazupe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160739ed9a2333---9617133050.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/nawalitubitiwane.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466487da06---zedonakerexigulodoweg.pdfPDF link annotation
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ls5ctcbh874qh9kl4drc9hc1kf/wudaxemuveziguliso.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6fcd85cd9---91861165313.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729327e4799---geropuvimumamowusaxewuti.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083678d03c7f---gakijozexamarubarizesam.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/13794393400.pdfIn PDF document text
    • https://dcimx.com/files/mosoxukam.pdfIn PDF document text
    • http://mopron.ru/upload/files/92439507860.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c838463749---12840463464.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bewuvovemuromidiwi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/popexisifiwib.pdfIn PDF document text
    • https://majubesar.com/contents//files/kajejogabufedupatagube.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e82a8c495---bakipuxodurokibu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/52623510212.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/33044125227.pdfIn PDF document text
    • https://schmitz.cz/res/file/gadim.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/17422561744.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1ce9a20ec7e7381e2a0903adb8ac3e59/fetuwod.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/dofafokisenuxekufuj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/eaen87qt0h1d45kkdrtj1b4ubn/47850033332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dls+20+profile+dat+barcelona+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_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 17332 bytes
SHA-256: 8e2cb0f50a2c645479c71c776a738f2d6b46cef4a5e19594a61102b471b311f3
font_01_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 11084 bytes
SHA-256: 3b23cd47616e698258184e77605eb11eb745eb30d87f3c53b0838bf58afc9cdd

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