Malicious PDF — malware analysis report

Static analysis result for SHA-256 43230d5969dd6bd6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6cb2929f91d20413b36c91f3542741e9 SHA-1: 5d698efb251991edac7fe010a36892752367f264 SHA-256: 43230d5969dd6bd65a4184e6213c273c96561749dea1e2055dd30c00a9e17bc2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The primary purpose appears to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h3nqsplh0na5j1sbvuvbc7eju0/duzifemita.pdf In PDF document text
    • https://groupburuemas1.com/contents//files/vubarapi.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/27861994320.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/68644241025.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210622_100632_8331.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pisezes.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115187dbef7---26752107108.pdfIn PDF document text
    • http://hasyo.net/files/file/72599431078.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/fevamefulesetiwelej.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/80838166775.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/68df4af5f0b068b005764cdf9b752601/78530774522.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98287b0284---kazomituduburizuworis.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/bedakilos.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/tukamepawaravi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d6e4f35d3e590edd1da6ea4b6b66f248/30407642113.pdfIn PDF document text
    • https://wasael.com/userfiles/file/731979773.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/51322871264.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/7054984722.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973151bd8d---texojigoxazi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/300a71332acf68c1442f57f24826543f/923504861.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/3729979850.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57c8a0abe---8021942463.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ffa76e73237477cc8ec35d603ad454ec/ratewavanoletedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=class+8+english+honeydew+chapter+8+questions+and+answersPDF 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 17584 bytes
SHA-256: ac67930b2f97182b433b93e4633e3e61e30471da198cb19019fa545d4d6a1b16
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 11480 bytes
SHA-256: 7eaa09cc271c30c58d6d2045f1111593f9289db67d808a4e2fac816a3c119a87
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1