Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cd1de0f1d8944f…

MALICIOUS

PDF

104.1 KB Created: 2021-09-07 11:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1835483442c5bb7250e2bb58cf6681eb SHA-1: 1531d3e52d8f69636808742baadd4a9e7da3033b SHA-256: 47cd1de0f1d8944f768e11988658970bfcb39b8afb40eeee0c10d14158416332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure suggests a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f2662632---43099234689.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e41d5e3edfb3d17c4b1f664d0b69155c/84426424565.pdf
    • http://koreanhotpot.com/uploads/files/65528294882.pdf
    • http://ottotech.center/userfiles/file/jijinam.pdf
    • http://ohdiabo.net/images/ckeditor/files/laxotukija.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602676fcc5---27793707755.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/favisiv.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f96410d24---jatexidutobisoti.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a34818ebbb3---65762698183.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/pogoz.pdf
    • http://chayka-svg.ru/files/95274405898.pdf
    • http://tksvolga.ru/userfiles/file/vasotositesibusexexafaje.pdf
    • http://mid-europe-ex.com/images/blog/file/50408542164.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45436484173.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dc679e125b237d06b9c956da6b9101c9/3668482098.pdf
    • https://unicon-msk.ru/data/files/60627540832.pdf
    • https://ilmercatinosottocasa.com/file/gimibamij.pdf
    • http://novichiha.ru/pic/file/pesav.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nitowisabisedomav.pdf
    • http://seamcc.com/UserFiles/files/wurapogorawivasefekudob.pdf
    • http://bydnjl.com/userfiles/files/gatuwimebizuxiw.pdf
    • https://la-klamm.org/userfiles/file/xevul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vote+of+thanks+speech+in+malayalam+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116aa.bin
c5d3b969019d2d9daef0ef5784848ced4dac0e47176bd34ae977946d117ec9ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 19920 bytes
font_01_sfnt_off00014b17.bin
4bdcfec219ea11685c05abc61c8542916dd9f526dc85cc430b0bf9d18950e896
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 10960 bytes
font_02_sfnt_off00016461.bin
1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
pdf-font-stream PDF embedded font (sfnt) at offset 0x16461 16148 bytes
font_03_sfnt_off000179ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x179ED 16792 bytes