Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaeafc03dae5c5fa…

MALICIOUS

PDF

81.7 KB Created: 2021-07-29 19:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ace4552b8b29b57d7a8f1badef79d75b SHA-1: 526690997de501ddc1ca086a3e684fc48490a37d SHA-256: aaeafc03dae5c5fabd390bc0979555551f6820f8fc15b56f6a089eb0b748e395
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

Heuristics 5

  • 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
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2gri9uok8cafipn3m5ipv9hece/98621086901.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/puxesut.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/91620232034.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ed2323ed84493b00474a28b9f5724dc0/tanofixorab.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zokumonasal.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/52869011344.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xorawofemugimo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/maremelivavesunuv.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/14016401440.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/3272842123.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980ed57dd3c---97047296308.pdfIn PDF document text
    • http://sns.hu/_user/file/4475478617.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16079089448b31---dakosasifipe.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/65836413917.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/83f0875062084388abe9122a497d4e7a/79640999434.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/49950699349.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/vuwenewaxogukin.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbcdad08a---xetazagetapupupilanidib.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/70794185156.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e88e240f6b4f3adc0f54f7ffdf8d4669/tituxoxedabawiwo.pdfIn PDF document text
    • https://bloomeng.com/uploads/88062763821.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fubaxix.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac14dd1d7---96541167492.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1b406314ea3cd8ff389eeb9cee6fb4d8/kupasarimij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=parole+letters+of+support+from+friends+and+family+examplesPDF link annotation
    • 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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16392 bytes
SHA-256: 738fe476016853f5fa10893cbd1ae8f2b1cbbce85533080701bf726e3b592697
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 10976 bytes
SHA-256: a93065bec045da4db0e95a871c4946bb04e5aab23f9ff4de4e7b52f698142fc7