Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e99a43baca0c649…

MALICIOUS

PDF

90.8 KB Created: 2021-06-25 22:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6de2183067797cb681c810ef892f3ebb SHA-1: 5cdb693110761a5b03dc3a8df79f1e98d5147701 SHA-256: 9e99a43baca0c64965a087ce92e196a81716f2bdf16880eac222e824eecc5b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stinpo.com/ckfinder/userfiles/files/11312635140.pdf
    • http://nakatka.com/files/file/jonokowewapolagaruzebosa.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/12178422567.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ad29351e8820733a0cc2b1d0de7b14ae/75571176138.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bbec42f8bb948e94ebd76856a77eb836/sewawo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6085f47d---13638619287.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e6997d3a90ad1fba018764f398280b03/59957137405.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609460f2c684e---53872127867.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4a7e3521---17663798800.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054706054---kokaputifatonufojivibe.pdf
    • https://advik.net/userfiles/file/savazokafokubigemilege.pdf
    • http://topcudental.com/img/userfiles/files/1648814492.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/fc34195ad212e4a9977109db2eaca794/62010780803.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4403b245e6---kemovajojurotonup.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u8fklkaublqu12veov6gf8i13t/57481966788.pdf
    • http://archerelectricsupply.com/userfiles/file/51337636217.pdf
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/32221653884.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93451da6e---jomosusumufog.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bv8n3qf0inj09i1pq2vk91ca42/donuvomewebegusote.pdf
    • http://3will.org/soubory/files/71523529608.pdf
    • http://www.medicellbank.com/userfiles/files/17786092738.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/206c3ffa12bf9b61775278bdfb8e9df6/33787037877.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j1b5q6e482b94h94uiohgtd402/31226176324.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7d1dd922---zikudev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=going+to+simple+future
    • 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_off0000ff9c.bin
d0765a1f602d5515a58f494e8e600d4dd3e7e8e734dc22e45418d3038bbc9c85
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 17580 bytes
font_01_sfnt_off00012d89.bin
45e0840be027f6115bc753488526499c0e8551fe1f2bd7e8155ecc7b9a6aa86b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10680 bytes
font_02_sfnt_off00014606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14606 16792 bytes