Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47c9a46f83b6331…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 04:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f7f484233c38d33bc8ba01c161b3937 SHA-1: 8298a5e835949f985536c639df13cf4bf9c65dce SHA-256: a47c9a46f83b63310f69ea0aca49e422011ac416e7c2b90651a9a47721dc94a3
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised websites, suggesting an attempt to distribute further malicious content or phish for information. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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 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.
  • 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://libertyquad72.fr/userfiles/file/jabajarozotokopupasurexu.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///gatove.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ibnpft9qdg2mksjac6cro0gvn5/76987606278.pdfIn PDF document text
    • http://canadanur.com/resimler/files/46358818006.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/mefofopulexaf.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nelunadexo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e30aac7a---7649238002.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/98354795644.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7856773d3---95600766163.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/dinawitovuxa.pdfIn PDF document text
    • https://best-label.com/upload/files/putofefasodokutawenuje.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b80aec1b---nakefagixozilejovijum.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/82924044819.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/32678017680.pdfIn PDF document text
    • http://iknow.pl/files/file/13982177624.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b349981153a1f0f0c56fa22d85a7c1c8/fomagata.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1onbv90kuuht3q6mkjjdijb2b1/60086757997.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/2531688826.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jixupuxitijufuvafogudifu.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kadaniwunexif.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e3a7dfaa642cc4e95040fc45aef812c0/zafumozez.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bea37eb5d---5588797536.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bnld2hb8huvhrdsj0gem2d21hg/77852480298.pdfIn PDF document text
    • http://efrex.cz/files/file/35359037781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=introductory+statistics+a+problem-solving+approach+solutions+pdfPDF 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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 17656 bytes
SHA-256: eb5c4e431f3ad2da38d13b4915ff4c51369e4d0893f948aee026c474d7d25447
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 11472 bytes
SHA-256: b1cc33ddf3137d5d22d0f1283b6d27830cd2ffde69330ad70c27a52a8b341fe3
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1