Malicious PDF — malware analysis report

Static analysis result for SHA-256 48592537adfcedf7…

MALICIOUS

PDF

147.3 KB Created: 2021-06-26 03:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce33eea5941e209a0bca6c785e4facde SHA-1: c158312162af7e31229efb11758b198425213e7c SHA-256: 48592537adfcedf7ad13a435ed6a6f2747088e241aa8059bb08532162eaab9cb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple compromised CMS upload locations. These links are likely intended to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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 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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200fb6661---xopififimodetogezomo.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8ca14b6---mumixi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f7612133b---situjumevigumiwaxele.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3306f2d56---63710559370.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oirkp8gehjl0jhp3pjnomomp07/94440757728.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f5d68456---luronobukosadijoduzagor.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d055ddb0e74---pupazawusu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9vgt8dvmgbnua0bql9nt9u246u/96381889064.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef7732c96---zepudavikokexovivizuxipa.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/83917225683.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081849188dbe---xokekabogukenudomimo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d579f5e3---45353210465.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/budageve.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c3d867eb---xazubixofebozirixunus.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7f0b479afe1840b923e85ee7f080f45e/69967526816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395eb6dded---kabofemadomodamewegudowux.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/68645970778.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/topamibudimov.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef3f93634---33382680027.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609448d05ba00---39730807284.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5788f72bc93d85d82ce4e4d85cfcf5ac/jilubitigotoninerusevose.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210606005634_761294366.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12471385509.pdfIn PDF document text
    • http://minipit.com/data/files/ribuvojufusavuvudatar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=self+doubt+meansPDF link annotation
    • https://mediaget.com/userfiles/files/natokejoguzavetebofu.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_off0001dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCAC 10636 bytes
SHA-256: f0ad63f45903460458c8a14b02a61e03d58fd09088a08fc2711d0fed23b396e5
font_01_sfnt_off0001f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D1D 18552 bytes
SHA-256: 942e5984cec861a8b8bfa932e8de0a1d21124820b0f7846e8dffcb790eb27712