Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b34ace1aeb476a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 06:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c89079e929e7ec42bf25111c6b650ed SHA-1: 3b5623687048a64f302447d7cf05a7655ea047b4 SHA-256: 90b34ace1aeb476a789744abf82ca18d8f3730d414430cb6b34f8cbc087d20ef
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites via the embedded links.

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 https://inwebjor.ru/uplcv?utm_term=jspdf+autotable+font+size PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/61592959808.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/32832844680.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/filipalanag.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9p2ah2l4oonctf8glh8mapjthb/69711065367.pdfIn PDF document text
    • http://lse.hu/userfiles/file/85718246209.pdfIn PDF document text
    • http://banquat.com/userfiles/files/92217477607.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16110f6d8eea71---42836028488.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/48799349673.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/084a79e92d084d09383e383c31fdc04a/71235845406.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a4293bc9---81407538153.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/nilajokusoxotifor.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f099c266a6---1353557468.pdfIn PDF document text
    • http://novafish.it/userfiles/files/54349627318.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/parapufu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ff751e5f6b25f088b0e69a53657b3467/roliwivupuxivulasojub.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30722200066.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/38514572940.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/68857149369.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/54609383224.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/zetamitabajedafowome.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/23299902733.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160891422bf86d---11288342029.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/20844471075.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6581be0fd---54142378459.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/16703043738.pdfIn PDF document text
    • 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_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 17132 bytes
SHA-256: 3d9af28d688ca17de613acfa86e600d629e0dff11bf923387fefff824f4e974e
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 10680 bytes
SHA-256: f4c911ade591b7efac73f25854e2e1ef09336f1c14c093aa95a0f7397899efc5
font_02_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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