Malicious PDF — malware analysis report

Static analysis result for SHA-256 148383a7d87cf8a4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 15:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cff85e0278263418014899c7eebc1bb2 SHA-1: eaf87398805e9e096a51c2ae5f9fc9cc16b52a00 SHA-256: 148383a7d87cf8a4fdb70ead15e6a353ae839dd9ad3953b4a03d7300b8c7049c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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://frisch.ro/files/file/95490533249.pdf
    • https://costabravas.com/uploads/localidades/files/wozogavo.pdf
    • http://travelshops.pl/userfiles/file/81931755148.pdf
    • http://isisthailand.org/file_media/file_image/file/volereb.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c227aa3cbb---wabifagugivejizu.pdf
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdf
    • http://odessawa.com/userfiles/file/zedivoteginuves.pdf
    • https://12shio3.com/contents/files/budiwanesawevinenitu.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/mabos.pdf
    • https://magnettoptan.com/upload/ckfinder/files/wisudefij.pdf
    • http://dobrejaja.com/Upload/file/jijuvudojosovifulivuz.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gogukugirexel.pdf
    • http://alajwakh.com/uploaded_files/userfiles/files/3521002129.pdf
    • https://clickbox.ro/images/file/xigovewezideribuves.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/kipajolaxeb.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ch2ff9i6bvp4q1luvpdbsa5qsq/jetep.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/wuvoxaravewagu.pdf
    • http://custom-mugs-factory.com/uploadfile/files/xazonineperedofaroxorot.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161417badb874e---97749365398.pdf
    • http://a-pluset.com/userfiles/podaniraverixobuw.pdf
    • http://igabana.com/upfolder/e/files/20210914105343.pdf
    • https://kapokcmassage.com/uploads/files/202109012138515617.pdf
    • https://mmagame.com/userfiles/file/lugusuxalaposataweto.pdf
    • https://abouelhoulgroup.com/userfiles/files/9794360753.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+reset+mobile+data
    • 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_off0000ebd2.bin
0c7e6c5164f29caea9e9b8baefb6f41965a89cdf1d73ca21111e4e72ab6443b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 18452 bytes
font_01_sfnt_off00011be8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
font_02_sfnt_off000133ff.bin
d0296b06489b24a8d89a72ffb54923fb1106a046a68af44be7c0b33027952469
pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 10520 bytes