Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dc106ac261c745…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 12:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0ce59d485765fdd816bb14bf6e269e3 SHA-1: a51df54c9c431dd3db7362b681839b61d59c735a SHA-256: 97dc106ac261c745f25baae89f2164ff6abbe1869e8f9fdad5aa3ef3ebafa135
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://giorgimpianti.com/userfiles/file/nibuwafelubawugobaxo.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aefb44747---jetixaxorovofupijasuguk.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gru600tvbfs87cckrefhjbpio7/zibatazozal.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/mesutizopuzoz.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1572eb9b40---junegugibutasu.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/vobenegurezilamuwa.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/6189075424.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/66057151709.pdfIn PDF document text
    • http://silver1979.com/upload/file/35586525645.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160866aad56be5---12094217496.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608063f441e3e---lezepu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966939094b1---wiwizutipulixasagifibadin.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b6764416065d9697f9289ec14752fbe8/17035248120.pdfIn PDF document text
    • https://sanidom.pl/img/file/9139199529.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zibovonukotupada.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/77179959091.pdfIn PDF document text
    • https://davnosti.ru/upload/27260085545.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2usspglk36qn1vqo41bsna2kh2/fitatigadowakatuba.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigezamarirokolub.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gidipolovedisasam.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/gowoselaxi.pdfIn PDF document text
    • http://tercovci.cz/files/file/19784902036.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/22429602313.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be005c9ca2f---46135937896.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/jomimizopameka.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/63644256800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=future+tense+worksheet+for+class+7PDF 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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 18892 bytes
SHA-256: b322b2fec51ac5f35f520862439dd04aa81964825451c5b503be1c317a749e41
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 10648 bytes
SHA-256: 1e64b7a5866d3ac9d1f24df944d61052477bf23ae48a718917e793f391328933
font_02_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1