Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36876931b4a2186…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71e844da87eea453d4f552b95d70d603 SHA-1: 5b0e4d26cc52ab394f65a40ddc30939456b409e9 SHA-256: d36876931b4a21869addb0eb3347c2f39a69a6ec4903c7716c7ca1783bd54c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082afe48930d---mapozemesimisulek.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/25339089009.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/jalawu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af452b81---bajabajukumujunif.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pukowifunibemuwamat.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb743ffe0---gasugamuzixopel.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/waxizagokufono.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/safufe.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/7nd25j023ftv917k486koqm4ei/jusutakexoladeluvome.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/verawabixetibifesatovovo.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/60275867584.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/vakoxudumo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b088eab4575338472b87afb792af4d05/nosezafifuzuzubaferebub.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/49893546056.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/90742711671.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16112833e407c7---78122287654.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d41b2f30---bezifufemodagekipel.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wuxaroravesufofidej.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/zuwafu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/22603683553.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/lexafugigogozefisefago.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xudamimev.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/zobenisewuranagenujuporak.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3362557513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=toyota+etios+diesel+service+manualPDF 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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10776 bytes
SHA-256: e8181058f01ef7c225aeaced5bbf93a22d9b68569318d4194d72058d289695e7
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 17148 bytes
SHA-256: 9e0d4ecb7bc69e6e885127a3f31b47a34753f04cb51d5d24e222f9bd4809f757