Malicious PDF — malware analysis report

Static analysis result for SHA-256 58078587407925d6…

MALICIOUS

PDF

83.0 KB Created: 2021-07-01 20:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 849653397181373e731e741f98175f32 SHA-1: 9bd194b53f8f58073cc100c71ec461e4e9bf2262 SHA-256: 58078587407925d6127ba5536c3f4d654e52d92fbd6e77c0d7fecafd312d6059
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430101318517131.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8956f265---kalotefejiminamusonova.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xejatijuzujexe.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuzemawe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gudizafu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af86c652143---bovazujafodubapenik.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kijuzuratebiverokepivete.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca91e819cf---gagupofozu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/29k1vbn817bv6ga3kcm8q379p5/pivawulut.pdfIn PDF document text
    • https://basisnomor.com/contents//files/kuteme.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81d470338---56618578291.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ijpvai9mehrelv34u53rh5iih5/19999631961.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e82677115---18257761082.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/23a20b6ef1bcb18a3f88c49634cc7c0f/7511674953.pdfIn PDF document text
    • https://davaocarrental.com/images/file/kaguwijamejosix.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///85572860587.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/15163579426.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/newutegijuxutamavokido.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3453d5ee79---josibowefigofoval.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/fizopegimokuvavamizumuzep.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/32789daf6b98cc6198ea05c92dab24ad/28760693421.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vabpb2rs4ev3fr2kp2aorda850/18039926686.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa726e07cf---supopuwedepawoxenirepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=national+lampoon%27s+las+vegas+vacationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 8820 bytes
SHA-256: f0dc49b2cf5a7b46f118309b00172e46e11b879ea173789df7ac8e2867bc2f80
font_02_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16628 bytes
SHA-256: f00d6e1eb2f1bdd3f52956bb810c8a07a1de2f31525624514e8b74f6377d16db
font_03_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 10692 bytes
SHA-256: 62d8ea1c355c78f912920a355a225cafa969f99f24049e4dd02271dd1edddbae

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