Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8e36cc04160951…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 08:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e303a193ae37b6a9809c0736181373f SHA-1: dd440a60cd559db940ff52989c6cc0e74b803f26 SHA-256: 2a8e36cc04160951276f84aade3986ffecc851e2ecb28e6fdb8229af2392dc27
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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://prabashproperties.com/ckfinder/userfiles/files/52907842630.pdf In PDF document text
    • http://belst.by/upload/file/guzuvazonogumenuned.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dolebulufujavoperukuniga.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/wigemumadorusurufaj.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/15574443854.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gubifuporuzeradiminoz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7e7385a6b11a478f17a00d8eb7c990b7/1254362138.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ae41c9aacbe4c80100bebd86b62a0842/35923999433.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67902f854---32049566366.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b2tgqc3eq0nl0g5l0te04tlvf1/ranofogam.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/fonex.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wijepigejupu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044a4701e2---segip.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/veu1o43b070q5i7307mh25tcsn/64545464351.pdfIn PDF document text
    • http://korytnica.net/data/files/rajovikulijekubedegowu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/25159265012.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac1c6312---sajekage.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/69690445808.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/35538606163.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/resejedobojasow.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/15839624103.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5377cc18---67915802763.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/todekuzulufeponob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=%C3%A9valuation+synonymes+antonymes+cm2+pdfPDF 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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 11080 bytes
SHA-256: e590f33fdf9ec4b4e1d68f7687624b1a3c2bb5855d716e0e8e9da2045feb5b96
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 20484 bytes
SHA-256: 2ab890d989792e1549822b200be8d073d937006eb0068b16803f227d6b8c2088
font_02_sfnt_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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