Malicious PDF — malware analysis report

Static analysis result for SHA-256 55da56eefb114804…

MALICIOUS

PDF

82.2 KB Created: 2021-08-31 00:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f74f46b7b44722e5c1983b0e1a7e744 SHA-1: 25198a66782931853bfae0a930724509eed86811 SHA-256: 55da56eefb114804356e8e018fbd878061d6cb0910009acb02abfe7c73b1db1b
236 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. Notably, it employs social engineering tactics like 'ClickFix' and 'Clipboard command lure', instructing the user to execute commands in a terminal. This strongly suggests the document is designed to bypass macro restrictions and trick the user into downloading and running a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/uplcv?utm_term=system+event+notification+service+stuck+on+shutdown PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/50f8cd8960692388a58362db6ea9b0e8/56808054267.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/30742957375.pdfIn PDF document text
    • http://abnicum.com/files/file/19702636951.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/82855858835.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160782ec481cfe---kuzivilavivizidapavo.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/sudomegajegizos.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5db7efb6d---towipege.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0b7324a195100b56a78b493916c29b30/53242157147.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5da32fee---zijijazalejufubutopiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a15d232a2---4291348160.pdfIn PDF document text
    • http://dr-temt.ru/images/file/jotexirususu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c180afac0fd---zupupusosonudopebedipeg.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lomumogow.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3qfugg3tumt2v4el80q1a1dc1/xotimuvuj.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742c6dc7559---151873338.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/musowafofowuxaginu.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/17468361303.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/diduxegubopomemurumafux.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/227iqdtemath87tjnog3b5fcct/62669270114.pdfIn PDF document text
    • http://vhshf.de/File/dejasunugijubagagudovedez.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13039331210.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/botikopazibo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/75432258663.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/zofigutu.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 17936 bytes
SHA-256: ca82b964107064bdd388589a2abff26d84c422e0f594e63e1af598b6726b810a
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11228 bytes
SHA-256: 1779840a6531700d480250a371309defc9c4f8671ae5cbe3c34e23f1258a636a

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