Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d78cd5fec5553…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 15:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ed8f0725b9240195d523e0f51e9c0cb SHA-1: 3208d60c98423daae6da2334726b8d9ef47aba03 SHA-256: ab4d78cd5fec55532c695d366104cc0cb6a2529165d1d17bf108b1bedaef104f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The document body is unreadable, but the heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://tonthephunglan.vn/upload/files/nejifinigiwuz.pdf In PDF document text
    • http://geoplan.su/userfiles/file/lofudugazaxuginor.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dupstiokgapcqi4n8vc388dean/17237131742.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614412788a610---40413819811.pdfIn PDF document text
    • http://btfa.tw/upload/files/lubodefirovegojabilunoba.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/72070138740.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/23614341968.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/39681064174.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/49019073584.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a09765b32a---27561781749.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da58e80e30---nodebivovijogewisafulidob.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/36463642109.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/togesakujilefaxodix.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/bazavofowojevipa.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/81784937119.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/neseki.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/34422682580.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10433656688.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/telimerewarevol.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/fosiwibonujufinubom.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/20890959159.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/27ccc4317240c88a9f3b74c80e350e7a/pinazamasizedowaborofin.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b084c1768---41436604616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dua+for+children%27s+well+beingPDF 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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 11020 bytes
SHA-256: 638192bd8f698ff48959c41e19d3d42204747895ab51de201d1ede800ee98fcd
font_02_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 19320 bytes
SHA-256: a5f4c98ac7bfd783b0aaaa955dbf0d4f47bfbac7a41df77a8d40f5c3f71478cf

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