Malicious PDF — malware analysis report

Static analysis result for SHA-256 f579421b4d368fe8…

MALICIOUS

PDF

83.7 KB Created: 2021-07-13 09:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0717658cd4339db280ab7d4a07c7fb7b SHA-1: dd19e4b04d910b0435f37396ccececd5b90a706c SHA-256: f579421b4d368fe8d16fa823bf38587b80f3c607d091725ae42f9f0bfa6685a1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also noted as having duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gmicropilotes.com/uploads/files/67979479721.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/otqj6l02j7mcqfm5qvn288jtma/87353135880.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e26o1jvhd7sjhfdf4gv7vju5qg/45965035706.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160885c9c4ee21---44299326708.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160961e883d152---zelosegifisadotitixu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/36033201893.pdfIn PDF document text
    • http://amandamaitland.com/images/file/1957250266.pdfIn PDF document text
    • http://balone.net/_upload/file///43751740769.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7057bc503c---9599260476.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74a06cbd10b3a04e21dd1976c1309790/sezabone.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/74515818520.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/11943900110.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215142357526224.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a050260a1c0---jaruwemexisoz.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/36734945832.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701067cf7eb---boveke.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/89877065478.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/67312615620.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/buruwikumamo.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/27150721715.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160962aeaa6c0f---reporajulafezamux.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36abc51ac---51546094879.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a64ce8e6---mojok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=example+of+holding+and+subsidiary+companyPDF 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 17280 bytes
SHA-256: 62a4d0c4c57a064daa806dd219a80c4009e9920d9d4ad46e603eb63ca790ef0d
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11408 bytes
SHA-256: de3c0e29637652d507e266245ca91d6cfede13fb04993d595617124df668d952
font_02_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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