Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5528a408fa8592…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 00:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4902f67b2b6fabf813151c217398b81 SHA-1: b3a02c0be7038118c7e8e5e2641af4a826d555e4 SHA-256: af5528a408fa8592decbd65591374e1a9531a92bf7f0f7be7d0cb08fe84fd001
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=boppy+pillow+pattern+pdf PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/24860420759.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/matimazufawuxuluwu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bofopatepojorebupibasuted.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/lozefidagelumowugol.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/78d7bd2c76e452bb4fbfdda3eef06fd8/fuzezovulugowofani.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/rarurijugefiridudazabapu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/mitosivonomipimaval.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/xuwujegefalimezaxo.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/74834060948.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/upijoqg30fdp1ufum1u7i37si7/57261270831.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/deviduguzeju.pdfIn PDF document text
    • http://lawngo.net/fckfiles/3009316821.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/jewutivoxapasoleg.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4o3ui5huj498nerc1ffm3a11p6/82759320119.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac737654---kufimapejomanenoz.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zalupefojenonepixewulap.pdfIn PDF document text
    • https://everestart.com/images/stories/file/jidat.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-29/20210729215533435320.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vimuvumami.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2d7f2678f---limojiwinovefofepunedow.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/wewamojikiteramorelafef.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fde573ef3b4a3707378741306960b5bc/87911231178.pdfIn PDF document text
    • 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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 18792 bytes
SHA-256: b1d1b48ebc1e4a1b2b02934d6b45e331079aa7070cb3d1a1c82f702d7503b019
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 10576 bytes
SHA-256: fbde79c8018ac9da2a7fb61867e4d58c36836ed4111752d6952c2a3cf4506540

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