Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34bce78249bace9…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 04:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 276b2b5d3e61ddb325dece28eff8de92 SHA-1: 3b7b71597cb8c559081fa884fe96a732d1827978 SHA-256: f34bce78249bace99023d77c381fc7cc3c6563adc315f5c6f5473564ab7761f7
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. ClamAV also detected it as a phishing trojan. The ML classifier strongly indicated maliciousness. The primary function appears to be redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pathtojanna.com/userfiles/files/17006290274.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f825fe5f3vr0cdmdueqnb1g1t0/ritafarugizuxune.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/jimanazapokajixe.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37426d5ca---xufifurugonegip.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c879913fc2d---82681082141.pdf
    • http://verkaufs-akademie.com/userfiles/file/43881817638.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/n6qlno6bo4agra2t3pavt5ejm0/sipegulosazukuf.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/fq5c5h0fepf5olm411k98aimu8/poxeburowefemememivok.pdf
    • http://bpabv.nl/uploadfiles/file/sibolurezikuzisunamowader.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b78ce5b6---61408737658.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609454e3536de---rikoged.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/555von9vjuk166olq5mgvbuise/xojefivotili.pdf
    • https://gbagencement.fr/uploads/file/maxivonojojunamamuzage.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3b4918bc4a7cf7b62820111dc364561a/81793094616.pdf
    • http://krevue.cz/UserFiles/File/vesowakaxawamudi.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c5101e6dcc1---40722967776.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/ralupetekegojo.pdf
    • http://easyreturn.store/userfiles/file/39713955661.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/53eec1fbacf0dd836b7814f283279aae/luzebelakeko.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pogowivuvosopikomugaro.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66dcd9caf---42475415765.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607449d7065de---78612504862.pdf
    • http://mazdooradda.com/userfiles/file/pabezubupiwunafe.pdf
    • https://sunnyvale.com/wysiwygfiles/file/50681551745.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+word+light+in+the+bible
    • 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_off0000ea41.bin
eac5e93eda0072c2c80bd42e93f992c70cf1c4bc1222dcfa42d9751a3b0ea82a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10384 bytes
font_01_sfnt_off00010171.bin
177c1577917a2ed19c1a6484ddd5fa672ca106cc86be953335cf14129d556f24
pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16836 bytes
font_02_sfnt_off00012d3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 16792 bytes