Malicious PDF — malware analysis report

Static analysis result for SHA-256 b217fe963f0d4f60…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 06:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f52ec3cae24990828e79db961dca1cf SHA-1: 382837d54b67e7d7f6e2afe7dbc1fd74da35fc56 SHA-256: b217fe963f0d4f606690f3a6d00471e8d8e39a81713cf4de3250dc86c50734dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a multi-stage redirection to ultimately deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://sl-light.ru/design/img/upload/file/nedewijejaxelem.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330600580b---nasemixesisewijape.pdf
    • https://vildmarksjagt.dk/userfiles/file/tokudojawumedag.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608245de2a460---bukigigojaxeduloko.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/99816521643.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fba3905049d8963e2054e4bfca57de67/xoxidosiwomujafaxugar.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/basorepuvulenexaka.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20286a8be0---21579303351.pdf
    • https://nutricount.cz/UserFiles/File/vogafovotiketotus.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/8b23291c5b83c92bb0732d63ffa1c582/ridirala.pdf
    • https://uniqrelation.com/userfiles/file/fevelup.pdf
    • http://jarosi.hu/files/file/tujinisawobuwirikodedik.pdf
    • https://actor-conseil.com/files/file/60299137230.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b38df8f5f14ac814a65dbcfff1b8d9f4/nokuzelokodatimunubifun.pdf
    • http://wohntraumgmbh.at/wapibubo.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b184af30c7a---31828299995.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/jaber.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mhhr0jmdpfaor6o144lneinf3n/zexobakaw.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e5664651f4d86a813857877477ae00d9/57578647458.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c874cace42---mesaxagumutilamine.pdf
    • https://egokituz.eus/files/galeria/files/42619522470.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a64822c0---paturaroretabine.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5f690c4b156663cf114929e3f9f251aa/97636820902.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+word+value+is+derived+from
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db77.bin
d14e54169befae03cd33858950dc467a03b70de3828496c877a44117f627a832
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 19932 bytes
font_01_sfnt_off00010db6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 16792 bytes
font_02_sfnt_off000125c7.bin
336449d0862ccba7422436d3702b32db9d9ac845945409249a486d6154cd1737
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 18324 bytes
font_03_sfnt_off00014301.bin
d03db559901a3ecff2bbd1a29d1ed226e24ce3a283915f7823ab8873681e7b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14301 1676 bytes
font_04_sfnt_off00014afa.bin
c5c9b86da4aebff90f00c2e97a47d0861457d2083da8f7bd882e7bbe23ea8155
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFA 10632 bytes