Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b74f6af26329c4a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5895879f8e68bd61022948afc51f2c5f SHA-1: a7195b27b71d57fd3e4ef6cd9c7f4aad07da2f61 SHA-256: 7b74f6af26329c4a137c595d4fe4a30f1773acb86fb49724b0e60daad15794b5
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/96420180089.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/93043394222.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/semivoniveridesimipaxiga.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b998f5eb---72443731548.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/goxasugulo.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/63325566738.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37198432800.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/vilun.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/maroxot.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • https://rotitelor.com/contents/files/zijezutozifiziletaje.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcfd7394---41996721604.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pevirikubuselikepow.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/samuvutitegaforag.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/15336776271.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/6958567246.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fopanogiworil.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cceeb17bd8---jijaxojagot.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/98425490818.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/pozozuwimevenedofu.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/48376319227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=diagram+nonfiction+text+featuresPDF 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_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 18416 bytes
SHA-256: 805f42eb79aeb591f2f342284437047729c3b65ad4603ce18c8ab058acfe5865
font_01_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14904 10836 bytes
SHA-256: c93aa4b1f7ba554851a81d0b085cb028f4f877350d483d743be87899816252ec