Malicious PDF — malware analysis report

Static analysis result for SHA-256 8695052814798317…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 05:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5b96c184e45982b92234491abf1ffb2 SHA-1: 31ac0561b28fb9ba020c120fa8a802008d91e218 SHA-256: 869505281479831758e77335f122fe16d763aa74b8f88050773a026a221e9c03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious. The document's purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://bunyaminerdemir.com/resimler/files/godimowajadovoxix.pdf In PDF document text
    • https://miet.hu/kepek/nufakopagutu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8417078f---70477374948.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/weninizivabefidalubuj.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/aqvd18c8t797fra14rnsioeti5/gimulelapulutix.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/19258209556.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/gukazexeremararoliji.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/9310390354.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/97660154486.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/4731794787.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ccb85558---zonul.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/1474959191.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/xivika.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/kanoboneboworovuwe.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/metisifop.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/powiwaliledasadireziwiku.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/99261937688.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/dikipe.pdfIn PDF document text
    • http://chinazzjx.com/d/files/77286585943.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/20930792527.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/dowesowim.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nuvipimuvugupesefevemafi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe16aaa1e5---3295537634.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/22028181382.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6bc9771304bff98113a9f8707247873/kumax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=big+farm+hack+apkPDF 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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 10404 bytes
SHA-256: 91072ba5985ddc08ae1fb3c544cb75b3fe496af83c85f5408ed9a579fecd59ed
font_02_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 15040 bytes
SHA-256: e6f3027cc39940b852f7f074fba6f2102b46c9a23276fa371e936012456326ef