Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a75978b0d263be…

MALICIOUS

PDF

104.8 KB Created: 2021-09-05 03:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: acfd4fac7955bbae082ebb1a0f9b6859 SHA-1: facdb44274466ba4ac80b1b589c7a1be8ff54107 SHA-256: 76a75978b0d263be888cb4f2ec7e483d4820caef534e2f99b43cbcb5a8fa72c1
104 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL findings are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 http://centrumbiznesurawicz.pl/userfiles/file/2399431484.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729eeda0f62---84801081261.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfcb242da---10256484842.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/83878262094.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/koniweref.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/13be645ac6c429c2ef1c2cb38b80553e/4681163172.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/sufisesekufixumegemu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac750cf939---93214067373.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/77634750bc3b3bd434cd137a54ce61a5/tixoteresegukafurate.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210903_091250_104.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/34596932409.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/21374795912.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fbf428d2c1c4396e7d48e6823c9dc45d/81248817690.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/72681605595.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6a45b9ba---fofekavidurotatex.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ab0d182a9c0eb7cd40fe0adc396bcfde/musulebeveno.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/72424778951.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/betavitusosilumib.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e98e4739fd7b9d7a1217a407a50638b3/romipajunopazevifamone.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c006bfd6e09---47770913534.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efba7c32c2---wadorosukakagotawowi.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/51238913290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tablature+guitare+gratuite+format+pdfPDF 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_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 10772 bytes
SHA-256: 1e8d7e1e90c5dd5181b49f1b268e4fff049b15a3dda453a124b1cdb0555bf1da
font_02_sfnt_off00015f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F50 19996 bytes
SHA-256: 0fb0a697eb405b9337639caf856af5b6c6069d2a0375f05a53a9fc07393446ed

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