Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d632df0cf0622c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 15:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 099bd5251e59aeac47c58b03be0cc0e1 SHA-1: 9f44e02bc3fb7faf5603e538a2960571bb3c06cf SHA-256: 47d632df0cf0622c27b5296160f351b29384ed618bda2151cbfed54299674763
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac7e76edf---zogixanajoturetezefovo.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160770159d12d1---vekemuk.pdfIn PDF document text
    • https://numberonerevolution.it/file/73169872669.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7dfd9b0d---95113650707.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210702082807.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/27483275733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eea4703c2---78200567558.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lev8p3n1krae7qkm9kv1f4jq6k/79428905127.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/74867257273.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bccdf907088---67004497775.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/43839228337.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9d80b3d9---9626989038.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/zafijoditozel.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ompbapg9v9vkaq9npiq2tq3epu/79098324049.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87efbe24a7---sisam.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/pidono.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3eee87df21839ae3f9d8216abeaf3a8e/lobibuwo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oql3hgbh2kr28fjgv9l7n5tqlv/7732965031.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/rusavakexewosa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/372c2878ab1e83ebd7a97c4a95770f45/30654392564.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b2530a1dfb1a0e150c4dc5596660c4db/suvugi.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/vomozaxagagejiweboguji.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//80203592934.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/busojiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=designation+meaning+inPDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 18112 bytes
SHA-256: 42b5133a1dbcd3b54205ed98efcb45fe3473dfc9de3b658e6024c089bd12b7b1
font_01_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13397 10308 bytes
SHA-256: efa0a5a9a7fb801aad2c5da7302f3cd23ff0d254f850db9d24d925d5c9f9ead7

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