Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ba2f423facbc15…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 11:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2d3b86183758d17d6c02b0bc94f02ad SHA-1: 9762b73219afce91217145ddb85b4ae107907407 SHA-256: 99ba2f423facbc159a40524e7321b3228dad86f0b349b31d39fbc748f552d9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://technestudio.eu/userfiles/files/58119071501.pdf In PDF document text
    • http://orsini-blasioli.it/userfiles/files/vexafitakofakomusiporu.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/givejonojamileluz.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/karejimowulenefevirifepoj.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/97664914816.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/84179530225.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/tetono.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/540a4aea1d27b3688687af5e209dac10/16429142851.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210913054611.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/11257561387.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ddd0d7b95c8a27ab455049eeb94d6839/64826695276.pdfIn PDF document text
    • http://geotersrl.it/file/44440706817.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a6jdukri2cclslsa9be7tkjio2/wifik.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/11564573975.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/59205619753.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vimatadugofixij.pdfIn PDF document text
    • http://ellev.fr/upload/files/sukufe.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/11265039912.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16693317150.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/dalilujosawem.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2add3ba00.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce91817d0---sugoxawokodokoki.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/85249089322.pdfIn PDF document text
    • http://dentherapia.hu/files/file/67952198208.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mixaparilavov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=your+phone+apk+for+windows+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 10884 bytes
SHA-256: d487fb6582f3ae63f32efcb9a34e931ef67b5331985f656d7da3a448beb1020f
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 18596 bytes
SHA-256: 4593168fdc2249763c314e66b2a1d36542c7eba38211d6a6a917cbd281d621da
font_02_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1