Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c65089870eb34c2…

MALICIOUS

PDF

77.0 KB Created: 2021-06-30 02:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 25e6fdda7e8b43fd99d3134f0ee36f2c SHA-1: 248afe9a2284e59f946a14b1e280a8bd6fb300a3 SHA-256: 8c65089870eb34c2c24b5094201854aebebf74534afbb3d73bf386c1f07a48ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the heuristic firings point to the PDF acting as a lure to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816387b24e---44557826908.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/78030394261.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ada701d5be2c47b6dae0414b8bae1874/19761919249.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nukulibugepuvi.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/3rhoe5sriru40i3g0v2ic16ej6/72041445452.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b83a00d0f---1151454643.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a27c237da---jabepebisodip.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/84400459345.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76b6d91d9---lujelusila.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/21eeb50904d0a88fabd1b9c0d240cbc1/gomunuzikoxixujaxir.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/36401329234.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/q24bekdpvtdcbntmog3ll51qn6/nuseligitoxobafikim.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/39812112737.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/batawivebi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/naxinuvovupisoge.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/db67c744e369d82543da04bb459b258b/rilaguguzufam.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/efa582d4efcb4b0ac93f61ae8d8accbc/jozezaropewegofev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906ce557d3f---xunikefakunupenib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9a0ce8f68029c2ca606ef19e387a9fa7/sukipetexumuxagurog.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/26227734148.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/79593418751.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/54988253738.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b10a6ba5---dipelagadexavegipukeku.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/rifodinufufoxulemaxubep.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8e1bf1dfe57a35556008dbb50a6f3e89/rubufo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe11f991ef---17080224922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=indian+polity+by+laxmikant+4th+edition+pdf+download+in+teluguPDF 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_off0000c752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 11340 bytes
SHA-256: 75870e61d31fca5c08f1aa9d3475e69da42ed45de7939e5d381c044d2ea5706a
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17180 bytes
SHA-256: 19c93bdfd2b2df772f1f4bb5b9a7185585948125756a7c45719d67a7addcb68a