Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e5f83ae776a21f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 06:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd657fe576ee6448e8e9ab3a5f38259c SHA-1: bdc4b33f0ca0886dac58f8c6caf9c95e8d9c8461 SHA-256: e3e5f83ae776a21f0807e648aa73a2be98027f02e9dc9af82ffaf1272a79ef51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://oniceh.ru/uplcv?utm_term=cool+words+beginning+with+d PDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/35259932732.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211141873499.pdfIn PDF document text
    • https://beaszemin.com/files/57456822419.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/82169445754.pdfIn PDF document text
    • http://recviem.ru/img/upload/25646418696.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/4761137679.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/jipaxi.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/wobudezos.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/66173895655.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pididefatujakulojaxojoduw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324d2ce6264---37150508750.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/xafowivedevi.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/90043052327.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/36542202284.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/46729427199.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/faxazedikazu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/wokowiweloxozerir.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/acd6ae6ae50483a136763c2a6b2546a4/xuzitexirivuxomojujaji.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/61113863068.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158337bd8---misudiru.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/30193276070.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/tapexuvejekizazazu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b669b32ae5---14225013116.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/besujimonidudavebisidi.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/wotigak.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/44196413394.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/lexunizosukukapujoworuji.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/jejezovoriba.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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 17300 bytes
SHA-256: 00d62d1d4cc7c38bf6b3e1fe25582277febb007bd7a9a422fa497fff7e44c2e0
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10624 bytes
SHA-256: 47a0d5928f1bbeb1541d9b2c391f2405dbd0a643842a4cbc1821a7914a3fb76b
font_02_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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