Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97a574d6975f65e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 00:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17dbef62eed67b5a2226cc8fc372eeef SHA-1: 5d2939d16d90f863788cb6457e5692ae00805b16 SHA-256: b97a574d6975f65eca2ec5b1eac5bf28acfc2dd19cd85e4d7ceba32d2fc190aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute phishing content or malware. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gartenmessebau.de/uploads/files/78921169609.pdf In PDF document text
    • http://musikpark-live.de/userfiles/file/pawezepatekexajixaxumiwe.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/surodejopiwo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c17faa1a4---ganujexafebadugepidazero.pdfIn PDF document text
    • http://flirdining.com/uploads/files/37857730057.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/85776929456.pdfIn PDF document text
    • https://ocw.tw/uploads/files/79397266260.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e93da309b6f3cd2d8f4d3558685b0eb1/pejofekijaxipujik.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/10139192546.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/50138726541.pdfIn PDF document text
    • https://digicpictures.com/downloads/69155771129.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/93811228053.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/zusuxavabep.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lenibozegilada.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b370fa532a9---41351341231.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/josezepaxefesaf.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c78af1dee30ca3d46507910e1f0421e8/55906587290.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/21920566066.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe13a5e8ee---29237595837.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/82623575151.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49554484169.pdfIn PDF document text
    • http://chromavials.com/d/files/mawufufuviv.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/84883994499.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160beb673b3fd1---wololewemuluxatokonop.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/rixininivosij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ps4+gold+headset+user+manualPDF 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_off0000b6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 15800 bytes
SHA-256: a6142cef3e19833bdc6a3bd5766638f4567c22907d723f9d0542feb12344fc53
font_02_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10780 bytes
SHA-256: ac724e289499be1f8628e21bc21e2b1d728944982ed16de1b0827e62d6ca430f

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