Malicious PDF — malware analysis report

Static analysis result for SHA-256 a545ff326ab6c277…

MALICIOUS

PDF

98.2 KB Created: 2021-07-08 11:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53507087e16e262a413e4f3ea9ff5c4b SHA-1: 0267bdbc4210082eda8b7f4f8d90b013c16e3b18 SHA-256: a545ff326ab6c277433a4cc7ef2e8584425fc6997d46bee81f0d2bf93b20417d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious, suggesting it is intended to lead users to malicious content or phishing pages. No scripts were extracted, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=nissan+technical+manuals PDF link annotation
    • http://makesrealsense.com/ckfinder/userfiles/files/11067655492.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/220c4a9ca7a7cb565b4b1b9366a618bd/pogigezuvixabikopivo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e625d2439a8---xemajokojerazu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160812eaf4c8b6---nuseribefur.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f1400nhf5qmnqukv6c2s32aktb/lefivofekuviwezosiv.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedededbad6---gipozolufusolufalojif.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e10ac9e454f---35308412497.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jejikiwekaxovek.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///43529561162.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/kubasifixuso.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6f2ddc07---suviwopum.pdfIn PDF document text
    • https://hostingpazari.com/calisma2/files/uploads/sagutegoruvulok.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2350eb35---97183662140.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/965ce0288c34997e5e82e9f6387b08a6/82104829730.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b68dfe90f920f032179cbefc25e2cd72/78146921906.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/33185143828.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3a0545d9a5d5009064653c339fc82ccf/54770462071.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2ebeb2aa---69096763692.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/12050585790.pdfIn PDF document text
    • http://soles2walk.cz/data/file/voxokabalaputolomomo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kamapegelo.pdfIn PDF document text
    • http://www.emailposte.com/pictures/74320950403.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/65svu4evq17udq6rusaddijb67/5739128317.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d5b4a881a3fc8826d327da75cae564f/jupiludipijudepile.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160707158478bb---64397479996.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/65337158165.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_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 10352 bytes
SHA-256: e3c12e3c771e4362adba4077c582579227cc719724620fee3df5112c365cc818
font_01_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 19596 bytes
SHA-256: d7d756c6d8bbe1c3e71775e05ab1d3c9f12fa4f0e6710468b10d4549171e3060
font_02_sfnt_off0001638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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