Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5303892310c2c5…

MALICIOUS

PDF

104.2 KB Created: 2021-06-28 01:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a08fb6d433ed32ac3f0e452fedf18636 SHA-1: feee3eeeb160f4634ca9e324c92919a4801665a5 SHA-256: bb5303892310c2c5b0c9fbdd677c30db632bf55e818f441dabe86e893e8529be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious files. The presence of a 'download' button lure further supports the phishing attempt. ClamAV detection and ML classification confirm the malicious nature of this PDF, likely serving as a lure for further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • 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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8p376gemai8bgojjfe8isgi9ka/vagalalalifa.pdf
    • https://whitesal.com/data/images/file/3116_20210625203630.pdf
    • http://lafenicealcamo.it/userfiles/files/13782218033.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f209972b---vixotokelujatejatewej.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/83f4a0be41022f05b18d0990dd7b1eb7/wogunuwizenivegi.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bda56a380059c3499aceadd4d313af2a/52733120689.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4c842c4aa9eb2b2a7c06ab026449f19c/ganugoke.pdf
    • https://dacinsara.ro/fckfiles/file/mopamek.pdf
    • http://pnmanagementsolutions.in/uploads/togawadenugidana.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2b76e60a---70738116416.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c358012add4---wusaburoz.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d2ac6b63afb137c4bd430dd6d4d065ed/92047222109.pdf
    • http://pantipplaza.com/userfiles/file/52810870229.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d248d4e1403---lafamuwivovapuf.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/naritus.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaab055da8---23056472802.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f15a1a47f---99618071971.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6661e97fb---349190997.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbdef5eeb4---22032305839.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5d36ihv8dd7jdanilpe9gkq0d/gutilozaxalomedop.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160819f28db12b---87049273388.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c83131a1---83598308939.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=doraemon+stand+by+me+2+full+movie+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097f.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16092 bytes
font_01_sfnt_off00011ebb.bin
fd125a8a60b8493b287b500a8ff545ff70e06ddfe55556217fbfb1e771e2cf05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 3344 bytes
font_02_sfnt_off00012c65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes
font_03_sfnt_off00014477.bin
2b589dc1d59fdbc06642ee00ef6d865d06a3867b951ba96cf8e6f91c8650668c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 19772 bytes
font_04_sfnt_off000177bc.bin
7fa9a53d2c3d951abc41458cb695bc5996f761746dd4808cc0439c4f20044831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177BC 11280 bytes

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