Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f466052d02ff4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a8ceaaaca4d2c6c91e23e113dbd56afb SHA-1: 0bd3c1d9fad26b6f2a560bf873416c03cece0203 SHA-256: f81f466052d02ff4910b8420d000d0bf0460657568b0acd7f9be571c725536c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains and compromised WordPress upload storage, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://bonekarusa.com/contents/files/pizidarikifof.pdf In PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/47116773593.pdfIn PDF document text
    • http://c-amc.com/upload/files/69695568235.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/36392961075.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dizorakobowasoxikosupu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/50306449558.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/28632176884.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/24536705018.pdfIn PDF document text
    • http://eletmodguru.hu/files/files/45912126594.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2a32a01b---luxafonujofaradamarezo.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/zoxetokakela.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/69691885534.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf82878367---35758150433.pdfIn PDF document text
    • https://curvy.tw/upload/files/vepinozijatowo.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/60386893479.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/pudigebalokukog.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/54437819168.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/59433042297.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/9721894489.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/44694169910.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-2/20210702192800886675.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c67316cd---kipixisederulorefabaf.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb197ac4fb---pexunupodiwovetinutineti.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7d6bebe---917861212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adjective+and+adverb+prepositional+phrases+worksheets+with+answersPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 11104 bytes
SHA-256: 6e3afbb5a08374be1da38f9e74b354910a32d359cb0c45034f20a9e83e6c2cbf
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 17900 bytes
SHA-256: 72abb7f695ef6c43f9f7dbf2c4be70a1676e7f90af46287bb0e575bda3c0f44d
font_02_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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