Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcce928207eb256…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 22:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cc03bf706bf4146f036044012fb6ccf SHA-1: a20b5fcddfea89f73a6ea06fbe257adc385dd45e SHA-256: 3bcce928207eb256825656b3c59a13d7947746e515cc969afc4b2230c16c74e8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating a malicious intent to redirect users. Several URLs point to compromised CMS uploads, suggesting a tactic to host malicious content or obscure its origin. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://infrive.ru/uplcv?utm_term=natural+rubber+material+properties PDF link annotation
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/perasolemef.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50288800291.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/98994712840.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5d100ce3---59771593739.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/94880775329.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/kanibijizinenipiso.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/21732614715.pdfIn PDF document text
    • http://pasted-radio.de/web/files/99267570494.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kewirelavegosenupakil.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/devejakevilefepipofakuni.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/72810317921.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/55975697853.pdfIn PDF document text
    • http://balone.net/_upload/file///vewisuwinakedivogusef.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/b4psiqdhesmdq71hd9p5vgh0k4/56670737466.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/nafane.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fugeruju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407353d3ef---18524848759.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/45141887605.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135307a8ca8c---94586501665.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630966139/files/11008910355.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/varurigogawategipe.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/nokirinabuxus.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613933f977d8b---47384868492.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zumepaxejifizagixokixobo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • 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_off0000bb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 10524 bytes
SHA-256: ebb856d2ff761a85aef7e24ef09c6de794e2a2c5fb026b3325abed4f5bbe03e3
font_01_sfnt_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 15640 bytes
SHA-256: cd792015d55245f9512071fda4c3231cbcc6983f9c1b5bc2641fae22e5aa76f6
font_02_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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