Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540ccd598acfaea…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 00:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9161d2df98a8e33e1045c8bf18d20c16 SHA-1: 8df9207b338e79a9e28b38c4c30a2cd554d43e90 SHA-256: 7540ccd598acfaea350c6d9d2932063aa6c8eeeb0910f6e8d5db806e931641b9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to multiple external PDF files, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flardochform.se/userfiles/file/wikezo.pdf In PDF document text
    • https://olterus.org/contents//files/93726343625.pdfIn PDF document text
    • http://industra.sk/userfiles/file/445371951.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/816fb97bb77444fc5cb3223b61b20b68/rodelisenegokekisi.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/nokakegugamifidorutomi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vevavuxejafirobi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210609/file/58805138880.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28db7d2be---toselaron.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/80574845289.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/24498806416.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/rinazi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b46661f10---wukaw.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/disisebulaxezejob.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0900b9136---gajoxugumakodij.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3908212493---gosodemewenupirij.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/85717843893.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/89304946811.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/lozaxelegelade.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xivujebokej.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/57232575695.pdfIn PDF document text
    • http://rts-3.ru/upload/files/38478186360.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b1337d73107c10e4e3dba62599a947f7/25429044490.pdfIn PDF document text
    • http://cocoal.com/uploads/file/41652471227.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/godegawizadupusu.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91936661347.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56bb11870---42467217288.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/78503100451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=calculating+enthalpy+of+reaction+worksheetPDF 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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 18004 bytes
SHA-256: 70aa7a630a99ef26dd171b5c694c76ae8aa77cd1c21b9e321b5344ca0bbcaf5e
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 11180 bytes
SHA-256: 435e11bf6504f7557619eade2685b7a2190a9782593bdcf8a08887aa9e0d185a

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