Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac9da2ef2971d5e…

MALICIOUS

PDF

91.5 KB Created: 2021-08-13 23:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5d5ab5263ab98d9b552d967b9d24852 SHA-1: 664dbb96bcf9bf454316f9bc67433052445d1d40 SHA-256: 1ac9da2ef2971d5e5eb8acef7cfae9a39ea0b09b1d0cce1ddcdb95135b2a4000
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwallendorf.de/userfiles/file/97514827497.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9ec6a41708eac794e7e4bde0f89aacf9/76498163959.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/80380424985.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/atcvrk20ei6gfilr67g97ifln2/14380887574.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/zonopoxupon.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60ff5e6f4---70886573729.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cc819c8ee02c3dd0f57a51799aac073b/62155090237.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/89812791156.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/dofesetemukodaxa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0221298c---rituxiziniwowovemexajure.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///kitisukokurufaxuxiwelejab.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd881853---mupogof.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/43109884785.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/21999962140.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/wanimusexazulalojasema.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/wivavadetu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/timuredexirad.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/rolilunosufibubo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lv4l8jk1dvc6nbghba8m53nveq/regoniniwokiwu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050544498274.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39b38bdfe---92764858903.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v23oo6tsbs0op1ukv730557k64/jojalibijowotugubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=coursera+cloud+computing+concepts+quiz+answersPDF 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_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11280 bytes
SHA-256: 420762bead334f12f763eaffeb68b47fd7a6776dc230485121202d05acf3b108
font_01_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 17760 bytes
SHA-256: 2f54ca27983014a7b50a0d394abcdb09b4e015c729733ddf517bca60d1f63317
font_02_sfnt_off0001485f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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