Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4a43652aee91d1…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 00:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cb113bd195491ac202e6251fff36557 SHA-1: a35be153b8a3b8fef289160304538e0aa030bec8 SHA-256: 3d4a43652aee91d122cda716360b6ec9363c9037c33bce365acef3a94102e72c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, embedding numerous URLs that redirect to potentially malicious content, many hosted on compromised WordPress sites or disposable domains. The primary attack pattern observed is the use of malicious links to direct users to phishing or other harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=become+a+contortionist
    • http://younewstoday.com/task/userimages/file/mufupegezufisawolo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c125175421b---pekomozepufukatazudepu.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5c91baef097720659d45675eff947b7/mazidemesidugetutogamed.pdf
    • http://chalappuram.com/userfiles/file/nokanutesipuxabitava.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/avq1ahnq5gifs32figusjulk25/12100815274.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b359a09b13d---91963817724.pdf
    • http://aarogyamedico.com/userfiles/file/desuvupexoxu.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084d34e245c9---9670305475.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160948c053428c---6365544038.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070e058433fe---vuromusinanefi.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f04b082b---saxifurutu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0e0e419b154592464537d6ce850a1b21/65433416320.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608163f6e8052---50167896348.pdf
    • http://abogarestudio.com/userfiles/file/83848033686.pdf
    • http://baigeleather.com/userfiles/file/zopumerosezuxixuxabomaj.pdf
    • http://euro-ex.com/images/blog//file/gilozalib.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d545e6c284d---womopulupalakakojasoxu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7261043a1---janavepepalogevidinu.pdf
    • http://rolmech-strzelno.pl/Upload/file/bisuzolavelafilawumozudef.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd5ac5edb147038113aa371f5b015097/66085379536.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd0109c73b1df95c03b6cfef9651babc/bufodinitositabipibi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85a0e7fde3b5aa96d27b5b6f6d30feb2/fonexag.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dabufaxowulilisenekanexur.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/831a61f640a1f8328e7579212196a1da/40730129933.pdf
    • http://re-view.online/fckFiles/file/95452456681.pdf
    • http://ahsaipu.com/v15/Upload/file/20215131323599826.pdf
    • https://angkortaxiservice.com/userfiles/file/vegijalenexizoxivofu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f357.bin
2ce96a5ceb903922d0f1641080cba715a37fcf79ff60220df2040865c01432ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16828 bytes
font_01_sfnt_off00011f09.bin
c1b93667dfed48a5d1c8fca55e8f6e98d944542d1a133241873a141520b734ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10396 bytes
font_02_sfnt_off00013691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 16792 bytes