Malicious PDF — malware analysis report

Static analysis result for SHA-256 7149733fe7c88d5b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-15 07:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a51d248f10301f20bf33bbbe3536e1e3 SHA-1: cc52b49e8cdfe4f136dc21b84236920a96afc208 SHA-256: 7149733fe7c88d5b2d348a310372ac3e2412f50c755a04a00caf5cad56986817
104 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the document's intent is to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe58fad67c---47464017881.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/wifav.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0c481988cd64e687183c5fa95c036746/vuserunipixamolufutidim.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/molun.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/rogajaloj.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a7abb74a1eb---22478098903.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/79ebbjemhs3qbhbs0a3kstlqf8/99575845628.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/zobude.pdfIn PDF document text
    • http://myphamasia.net/upload/files/41587714128.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nitavosugetame.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/76231457057.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118296802c23---dijomomajexiverud.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/bivujaduzimavid.pdfIn PDF document text
    • https://badrivishal.com/media/warubevuvilasolumikajid.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/75307669439.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/9822260279.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a480d84dc1d---48798162167.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/928d06787a03f08a00c51f15f89a674c/raxudo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdda932634---vovaxidumixukanul.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/milebapurazulu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6321243c---80764252911.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/48449848080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kiwi+berries+season+ukPDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10368 bytes
SHA-256: eeaeb993207ec71fb78026ae9eb8082b3d4c127c51cc749fc30cdd534ffe503e
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16320 bytes
SHA-256: c1df2b4bdf08a2dd6bc2b53ab187b2f4d01a7df7686ef732a1b0f1db47e3b8cf

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