Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97e5cb0c770e2f4…

MALICIOUS

PDF

107.4 KB Created: 2021-09-04 23:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e6dea57f92344824a0af48c5d15982b SHA-1: 4adee93d019fe071c0a1a69629655b94f4ed8f24 SHA-256: d97e5cb0c770e2f488e4df2b6d17bc797b9dee767131b60c4127d33a35e49d67
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://educationexplosion.com/... and https://shevtsov-art.com/..., are likely intended to host malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/61063460541.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/sojewomotibotugiwuvadova.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/siwuforubivutexekara.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gevejanefepizusoluzi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16a730b292---18152003160.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160824d216c740---69009068493.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iaj3vu4temd3i57hvitm25avv4/wuwamilewo.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/31875261629.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/zituzupefak.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/15445157017.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/jipodabijewujuzawu.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/beruxazisixudidowidomadem.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c7a6d039---julojirugotozasevigo.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/gugajijud.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/rogeripexebekujotiredi.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebd7d256c---32120361569.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579235eaf---20792143808.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4kqdrqnugt5j89s6sa1ujamge6/920533940.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960f44630c1---nolimatumudiperibopanigow.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/nidufixif.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607879b24ae09---gapulovakakosafikapipiga.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/058225595da1ea294dccd254aea8c56d/piripuzatedifotugolonap.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9892438dd6d4eda4fda7875799b7d46e/gamefubelexodele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spiderwick+book+2+pdfPDF 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_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 10548 bytes
SHA-256: 398acd0172e6d572cadc2594940c8139ec037c9f8bbb8e4d7f919573d2eb1b5d
font_01_sfnt_off000159d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171EB 17836 bytes
SHA-256: 8e2c2677bc16e8c407edc8e1c41ab3657c00edf99ccbff1770637de04b113de4

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