Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7a3be5f7a148ad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 18:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 871ba1e729397d3252b47cea386f104c SHA-1: 5229f86a5afa39c89ae3e05cfe447432c58deeb5 SHA-256: 1e7a3be5f7a148ad8e2116c6b2173115ef7fc3d9c328714488ea44e4cdac35b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous links to compromised websites that host further PDF files. These links likely serve as a lure for phishing attacks or to distribute additional malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa13ba6e64---85658081755.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/02uoggrrl2mdvpmapn0snt6esd/56330867207.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/63496101a57e122ed8a51cde7784d18b/50978443542.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/22461925613.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/9699594889.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/47554472347.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c7c3f25a4dbe2b2cdd519ee26f27f696/gamusaxijovuwenajizujoruw.pdfIn PDF document text
    • https://drsaman.com/files/32879756126.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/rumakuwe.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/wipowufarajixasonisim.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uq2c3njcd9ac7pm24nd3mul9bh/migutajeguxigabovawi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lomirigakol.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/3147928755.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fnp8cgn8psjtgvt1rfifhb866/tududedurosexere.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/31697100236.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/41714706562.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/28512287208.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/40527185751.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146b77013a8---wopufep.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/35780829789.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/85254858029.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cc784b6f---72917637105.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cd8394d4232e9cf61ac25b229582dd48/jakuzimibe.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/gonos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=converter+pdf+powerpoint+gratisPDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 17960 bytes
SHA-256: 03636ab013a3faaf4b64fe035274cb503471a9c67fd562fc9928d63b5aa03dc6
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10808 bytes
SHA-256: 6cdf3bbea9edc0620d742b9a5ce83ad66955d460f539f7c4e0bce48287fee21f
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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