Malicious PDF — malware analysis report

Static analysis result for SHA-256 97df111fdb09b1e0…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 06:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0455ad3833330fca62280496f62d01cc SHA-1: 2f2b03a19683c1cbffcb10a2f743373880d4a8ae SHA-256: 97df111fdb09b1e04727edd73649a71d4e044ced4999377766f04a3529fd69c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://dentali.cz/files/files/64230230192.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cea7c7c53---livubugedimirasi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/13555619403.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8bba8746---sazapejajapor.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/zomun.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/19550827606.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/68cfivp85f4dd1nk2rt9pt0rt4/jimufo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/148a58e1cc421bde226829ad4014b03d/wejikakiloxukedisilabukuz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3c5852686067266a3324870663cb35b3/kotute.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/tulosudugogafepiximubib.pdfIn PDF document text
    • https://digireg.dk/upload/38350985715.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/aj73qrcltqgcn4lo4eaah5qg9r/19196042672.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200888928---labemenaw.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/minipow.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/xetagonon.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16a5f07fd---vokaresiz.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/gubojuwuvatupiz.pdfIn PDF document text
    • http://acril.ru/ufiles/files/12322502264.pdfIn PDF document text
    • http://web68s.com/upload/files/gomogexolexexuzenag.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/70784624199.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zalebumimokudezupomenuz.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210618052658_1906192529.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5nico45i81snssb6saabk5npv4/848916082.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1b654b23e6f88f351695a619e95f7aac/64129157067.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc67275e6a---bikarorafiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sia+the+greatest+song+mp3+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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 17916 bytes
SHA-256: ce3eb60b650890d2d9433d8b0c17485b7e28830630cc15eeffb48afe2ff81171
font_01_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 11172 bytes
SHA-256: 8620ee2812f788de46e42cad9bcebf287bc063e5703fc4cb6145f84184b713fa

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