Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c15d551adaebfcc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 15:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95611ff66c5348a495e2d359f25c0281 SHA-1: 889433a3e5f7fe4fc8dfab3856f64818f25dc81c SHA-256: 4c15d551adaebfcc1e8367cd567ad2e8504558b55cc862cba94ced786e332a4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://barcelonacentromedico.es/files/galeria/files/90412077614.pdf In PDF document text
    • https://next-engineering.com/userfiles/files/gesajonojawibuwed.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tfc1brev0le99fji92qovr0406/78466720651.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/6999314308.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zewawajamoke.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/mikezozugajaxapezofawabeb.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/najevofuvoza.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160895a189ac13---mitefomubi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975e5cf6d1---jaremogutikiku.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/61629572321.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/936713ed1c4c349a112ff9437f9daffe/43200591237.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7a8b6457b500731f3df430997524020b/62980571052.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/sumapisesolelopofuno.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/90561905899.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/wifobatilixanurawif.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pson167eoa97ui6a49rc06pilh/57864075256.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160873cd62427b---55810458870.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/69848619505.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/vigugekepekaparaz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g17u9ic4bvieoaqdnhp9abd1n6/6354554447.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f46624ad---wajaniloxewifijiben.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/paparaxawidadunena.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/93725787834.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/fidogox.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/negeledevadubofigubenogug.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6hv1r4ftv5l07itbqvoirkkc0r/91390383962.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105252045367068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=combine+pdf+app+downloadPDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 18076 bytes
SHA-256: 68848a01825765f3055a112e889dc677f8b7c5c25a3fb232fdac71f2c8a68257
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 10548 bytes
SHA-256: b1497797a93c23ef8e6f0078d571fd29e87a9eb52478447c4e6e85890f7af5fd
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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