Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08e402d233912f1…

MALICIOUS

PDF

79.2 KB Created: 2021-08-01 07:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1115317561c563f52bddcbfb4dfcadaa SHA-1: f0a8073c3134c6e2841fae67d29a3c424475929f SHA-256: a08e402d233912f13b165f9b657fa9eb7b9fb272599efaf868cbad3db17d2194
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qrdp242vviq9ct6b2d7nlc1eo2/dinem.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/11102304244.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b50c2118e---41257203531.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///75940561671.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec3881b06---35411585815.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/88427342231.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1lem3h0t1pugllpeqr9rpghbr4/97492543743.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jisujazutipupa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d693f06ef---43336619670.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/99cb277733b2401bc3af308e35edb245/96170026208.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54241b9b78---54295944065.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a5n3joeb74td0o2ansf8dv1d17/47276524178.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/89334913005.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/guwag.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a1d28jjeou7a65e305jobslgsj/95333230689.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93d9739a41---bigebudimovapaxawazu.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/87726634436.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608867bce2776---14582962174.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/duwakepavekepimuturavel.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5d4dc104---mesamotelelebun.pdfIn PDF document text
    • http://kunbot.com/upload/files/dozogoxulabiwapodu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/19562604502.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f1809ef7---mawumo.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/rakunugif.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/29e028a593367af3dd42647ea619f054/92547276396.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/24252648183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=s%C3%ADmbolos+de+la+norma+ansi+para+elaborar+diagramas+de+flujo+%28diagramaci%C3%B3n+administrativa%29PDF 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_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 17340 bytes
SHA-256: 49106ca2220f6621dedc77656e7a435177a2bb6279065082236016a1cf11a21e
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 11832 bytes
SHA-256: ce3a42d615193e6be9d4c06035219cc6fa4392e2c8faa94f1186431c35e968b2

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