Malicious PDF — malware analysis report

Static analysis result for SHA-256 989c97181514b0f4…

MALICIOUS

PDF

162.4 KB Created: 2021-06-19 06:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4048d7bb574a53a0a381d8c0355d0caa SHA-1: dab4938fad40492413ba44fd6138339fbe3a6bbd SHA-256: 989c97181514b0f41eb0f9cdbf02e144919ff36057af2645c08a8b95632d0809
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various compromised WordPress upload directories, suggesting an attempt to distribute malware or phishing content. The presence of the 'setcpu cracked apk' URL in the document body further supports the lure of distributing cracked software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9755

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
  • 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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8f9b8c988f9574ed46a0f81e036e4376/37410832910.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0ce6ea8e0a1902836167a090409eb7b9/kotoguz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/82669539535.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/30045887714.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876dbd82df2---xedopogizaledunej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b9333c76---54270470590.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/valerafe.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dab1ddf5c8a50ef08dae4b60ce4e82ed/rokolupenefumikibepux.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/79036248052.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/46773198953.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f94c8604f60d62bcf1616796253255a5/jabuzeniwu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1c57155743ab60970b867d39c93c19cd/kerupik.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/ponatenajonuwatuvixidada.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/22923027584.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a0c02e806bc4593d1c70c905effdb4c0/18274670578.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9187bed---71982428227.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a9584679---xogafatanidu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5182e820077298b5de18965008ecf6b/21754577223.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=setcpu+cracked+apkPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000227c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227C9 4644 bytes
SHA-256: f442d576759f29acad7911c4737b9c8ecd74ba3e063af8fe42f1db29724a132a
font_01_sfnt_off000237a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237A0 12396 bytes
SHA-256: 9f1a981f6a2f1fb5233ee3f16fa7ca66070dea9f3d5453a5ab7e2ee97daa2a30
font_02_sfnt_off00026216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26216 16192 bytes
SHA-256: 4682b72f2afa33b20cf875d84024ffdd6778cb348d5560ed491e7fe37e149525
font_03_sfnt_off00027724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27724 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34