Malicious PDF — malware analysis report

Static analysis result for SHA-256 81659924fecaf8f2…

MALICIOUS

PDF

158.6 KB Created: 2021-07-15 21:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a68e7223fcb709ab2690a9e3f77d634 SHA-1: 86135bec679770f83eb7bf7373f93c90bca66008 SHA-256: 81659924fecaf8f264382d50b0efa21a5f8149414b8d4ed5e5c9f59f557dd85a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, which is a common technique for executing malicious payloads. Numerous URLs pointing to potentially compromised sites or disposable hosting were extracted, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=luteal+phase+meaning PDF link annotation
    • http://sunnysolutions.it/uploads/assets/file/xotamixetazuketalasezuto.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a85020e81cc---tovoz.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ced4d11---89466557799.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b534a84e00---60259090228.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/ronikidikolutovunavubis.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0be3421a---baxudese.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8jernd78id36hb9k0vv570v437/7247044382.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/garum.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/882ea9f356989e6e9137918296b6835e/25861874552.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/72052015983.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/30844910197.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3488e5e2ae---63708624436.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430235252209008.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7238001a1f9606d34848425cfa4dd9c2/fozinafup.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a02bk016913aik5l4edo4cos57/xurudibugaza.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879b5111534---8054376080.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c676e0186ab---voboliwatelo.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/5708658372.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/nasuvobowegigapaf.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/65864850810.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/rolerabigowetawobi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bbbdd998---mifelopoxapi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087800cbf0b5---pixufazoguduwa.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/jafunum.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e258ae1f991d1750a5df5aafcd9a0c39/31324670805.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_off000207b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207B1 10536 bytes
SHA-256: a692674728e0052075a0771466e97e83e99c78af5b1b6d3932963a9ee7aa4e79
font_01_sfnt_off00021f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23790 21528 bytes
SHA-256: 1370f32e356f951ecbe32b189cf38927a5e212fce2ca275797a0191a03edf85a

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