Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f31678a8b27b6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 10:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9201187cf9544e095717dc7b321137ae SHA-1: 8fe51fe36e9fc8b735a8f73855ea876c2c4a5624 SHA-256: e62f31678a8b27b660432fa0971063c7bd25f60376acb0501708b7df62b67524
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data, but the presence of numerous external links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161302f9602c1b---rerixopegepaxevasev.pdf In PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/9366564732.pdfIn PDF document text
    • http://vlajamo.cz/images/file/87565848312.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/58190145076.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/13477885859.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tuxuwavus.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vorejod.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/divabonenoxasewo.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16220753996.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/vapigubiwulapajis.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/16215236451.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/rikemusufezomowok.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/14440048117.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/nidolomemesutas.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359b07c8783---82274852234.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197222342277.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5865512b9c541f193a34bef9597e09bb/81719770864.pdfIn PDF document text
    • http://mgrima.com/files/file/74341468229.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/46412008754.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/423888120.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/jetonup.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11a73d1---77323093456.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/49232769018.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137b87e1ea3e---bosomib.pdfIn PDF document text
    • https://diphong.com/uploads/rigafebenidowogudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=change+screen+lock+time+androidPDF 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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10940 bytes
SHA-256: 38521e16a8e49e7ff5cf001e3231c64a649ca4da925f5276441383b4088e7465
font_02_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 17176 bytes
SHA-256: 98a33d6dd32be4ef6c6656530c68f00189eefaabbeba18287c2c291ddd828eee

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