Malicious PDF — malware analysis report

Static analysis result for SHA-256 4549e09fda0a6605…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 21:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f16b5ea26698996ce4af6dd22ad4bf4 SHA-1: ac72ae1c17fdccee268fa743fc202961177f2127 SHA-256: 4549e09fda0a66051bc7b65bb9aaedc3e0441cd84909680e0ff8d189c7e1a8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many hosted on compromised CMS uploads, forming a link farm. These links likely lead to phishing sites or further malware, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://crysiq.ru/uplcv?utm_term=watch+selena+and+chef+online+free PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8cf55bd8fc1a65220f105665db8fcd6f/14234419642.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/79157893889.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/20444784033.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xegupuwufuridowepefitew.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1c659610---59176953991.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae7499e23---jonekekilagelefavuf.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4kea7srsfi656hijbqaa22mdib/84870229566.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/gagodexisosajuku.pdfIn PDF document text
    • https://kede.org/userfiles/file/maxaxatanitixoveze.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d205003c51---beravizasufitotusajam.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xowifimewixeja.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1td39nh1jc76ot5r40gk1t02nn/87505043809.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5b911626---93263348363.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/wajaf.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/51414576305.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbbf6463c---tesosovaxudedadikeveba.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818d8b827ba---51160932411.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3c54f2fa347c6d6a0265a88a0e2931b1/32011192139.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/25677671428.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210515/210515235715274239lp0i7y247na8.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160771a0e4fafa---xuvawisetesagifunimoxibaz.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd67bb4faf---kojuxotikosemezopitetona.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/36500909445.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0356dc954c---xejutuj.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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10568 bytes
SHA-256: 0b3cdb1694ee116fcbcf7e54192019c0053423d38519e031eb9eaa44b105f9bd
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 18016 bytes
SHA-256: a0e73dba0e92372e0af8494a09c140c5231a3c4ca11a98125b8c058c9d939894

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