Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cef5ad54f6eccc…

MALICIOUS

PDF

77.0 KB Created: 2021-08-04 20:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c979d8be527541d55010c9e274e3fae SHA-1: 6a291eff10ce34da82b26eef67a84e5e352c36a9 SHA-256: 13cef5ad54f6eccce864d98d2674701c384c06ff1687ce7ae5c612ae17fa0348
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://centralgiving.com/media/userfiles/file/54238640321.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da28f202c---tizepevatal.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lt2otp232ntlrdua4ru9etgin3/27926709790.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bf4baed96---81247662158.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/dolaninokotivodibarijo.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/43638557826.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/keselot.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877761e7278---nawozipimekasosu.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/fuwopux.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9b70e5dd433b09ae193747a89bba9d3e/guvejezivikexegegetatuli.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed1e701fb---nenefowuwoxov.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20523619262.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/65716300197.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/vadaxajikuk.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/6acc53e76a26abb7fa531971f4dde330/20272596504.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/foneju.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/89702578718.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551eee5179---givowidujajejo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c1fc5c0e---gerutaxunarunutogi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kv8vu3am2acqoeqd0jiuqq9qsr/48292622516.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8baijfbpt4hrhbqafc939ts73k/fofesuviwizimutikupuv.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gegiwagominoxijanaruk.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0154214001619996138.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5d66c674---varuwilonazurisuja.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/tetomasomoporopata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solucionario+matematicas+editex+1+bachillerato+ciencias+pdfPDF 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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 11356 bytes
SHA-256: 84b200ffd2be3b93d8ada10d97ae699fa962657c91035b13d30d6cd9a4666ff1
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 17812 bytes
SHA-256: d18499839cfb8a8c40593b4834c4f048446f24f980b1d376280798ee6844add7
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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