Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8c304e5301ce11…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 11:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 011e20229a1f5e35013faf83b3266d7f SHA-1: 972a20dd8052a65c8f9e1fd6cbaa3f5366fe851f SHA-256: 7b8c304e5301ce11e3a6813b98234413f9292a75409ee211d402ffd6b300b071
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external PDF files hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristic firings strongly suggest it is used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lukinserv.hu/file/97295317358.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/61006001459.pdf
    • http://aite-materials.com/upfiles/file/83744988450.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e8b612d0bbd7b4c0e3f7ec9abe6ddfca/fedot.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/valivipom.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/nenurixuwesozupulanurefa.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b1563bdf---wejajidapokupalojud.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jq7u7h41ren8ulrvo12filthbq/12513651323.pdf
    • https://benqmusicworkshop.com/fupload/file/89710833641.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/meredaxegepuxuk.pdf
    • https://aduanaldelvalle.com/userfiles/file/22360239507.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7bd86fa3a555d9ccb8643c0458b5928b/9906025545.pdf
    • https://mvpartners.be/images/uploadedimages/file/kuwawuf.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd18563664---zepajovezemixon.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586aa2d12---92428996740.pdf
    • https://micro-logic.ro/images/uploaded/file/83181182400.pdf
    • http://omonetach.pl/foto/ilustracje/file/67197425452.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940bbba3f15---wolonutidoduxobogulog.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/un0sjqdg7ilsm8j9uho220ekl7/taxekofot.pdf
    • http://bukhatirhomes.com/userfiles/file/15012681295.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/35jk1hq1rmmktithqmqodib2u0/5246550013.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1009f31ccb42c5883972bf03d1234b1/nuwarutujajuvez.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/09faipf9s83f7f0i5ah9jtuadr/jupisom.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092314a0617d---wezoxemem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stick+warfare+blood+strike+codes+apk+latest+version
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87f.bin
656e92254ff59d698fd8fb2fa1d85e112b0ef61a3a91af4ef657340629c34faf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 17176 bytes
font_01_sfnt_off000104e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 16792 bytes
font_02_sfnt_off00011cfc.bin
0b4fe1a4599f67e7a51ab00c5529ead525ca8ca97fbf5f312c7046cc2da6f0a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 11072 bytes