Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf241b18cc6bb66…

MALICIOUS

PDF

95.1 KB Created: 2021-07-05 01:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: feda19c19cb919b622fbd0e87cc9db00 SHA-1: cb92f1eee1b47860fe3c88c4534d6afe858626b2 SHA-256: faf241b18cc6bb661f0c8c7f156cdf51b598a429828ca501ff5a9ca955bbe983
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. It also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The presence of PRC/3D content and ML classification further support its malicious nature, likely as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tcn2h1prln2o0hgo4dtgcdbms4/26063324584.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9af361827dc5f6ce93ccf7725bbb0682/kiwavozipeguzu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe84dc7bbf---95399833231.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e7f4c047af27e5f697ba4229814e2372/xomem.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fe70b32e4978afd7688fee6e15238ce5/51565898812.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/20390214863.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/miruzigowugutovowefo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd40a8ebc---95015710311.pdfIn PDF document text
    • http://gyobel.itpublic/file/winixaredenesuraxawu.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zunaworozazef.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/4281208686.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210611212926_192041505.pdfIn PDF document text
    • http://asfalon.com/__files/file/kipavuza.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c898d97e---finevol.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097684d38029---51469768272.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896883545fd---79417323832.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160792bca491d3---54745735957.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaecd8c76---xonovapujujajagomo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c9639994---29472194044.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/maniubfa1bl57qvvgald4118cu/puwamuxadulawigozixe.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071204f33352---58372849213.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/legonefuxuleseso.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/lebaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+the+invincible+iron+man+full+moviePDF 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_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10732 bytes
SHA-256: 04fd7102cd452e0d90a49cd533cfc5fb4fe4d4d35fa10c954b4ef4256dd34cfb
font_01_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 18632 bytes
SHA-256: f5e92c1dd1433ba1905a390212c4269ed06988ab1f24d24fe19bfef00029cc3f
font_02_sfnt_off0001553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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