Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aa9462cba29254…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 09:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf8dea26b4eb402628a368c6768b2d2 SHA-1: e9d160e2715db9d0b262aaff82453a15a2093914 SHA-256: b2aa9462cba29254137164f5d4aced4ebc92b81648e87f6dc63e8de9a58ca5ca
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links suggests a tactic to obscure the true origin of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://blueyee.com/upload/file/031225499357.pdf
    • http://superplasticizer.cn/d/files/novufibetopijiribototofa.pdf
    • http://rund.cz/UserFiles/File/7236337212.pdf
    • http://digemnd.com/UserFiles/file/mutufisugeludu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841e91b6401---mododuwapinop.pdf
    • http://myqself.com/upload/files/kenizofoxufodukegapezowa.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6b32b798---32219167642.pdf
    • http://lubrifianti-auto.ro/files/file/xujomopeveselarodew.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8722d1ba8eb1b93e91c395f85a6c0d94/17714208894.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac947822d---26626395821.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8fb017b32949c686299ca17934300c3/tanipimesoditire.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd238c1cd1c---tisog.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8ce07fbe---duwowolani.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/davewezibapidote.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/galetuvapo.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608785d63fa75---musabodawa.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gqokp2vl98bb1glilmd7u1famg/88910039245.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acf444b0cde---97355972574.pdf
    • http://tai-yang.tw/taiyang/upload/file/19262380802.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d222be10903---gojatupixuzadomaromutisu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16079ccdd055e6---51991664145.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac139364b4e---vufuxo.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c5760931---vobosewasapiwumik.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3af6f424.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mens+names+beginning+with+n
    • 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_off0000e333.bin
ccc60a76295fb89890552f35c946bfb4b10bd10df10b7c27ff03d05065b4de2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 10508 bytes
font_01_sfnt_off0000fafc.bin
8cb054c4fa1e26015915979b4a58d4e18893df06d0ee334c27c5774a32701dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 17160 bytes
font_02_sfnt_off0001274e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 16792 bytes