Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef13ee568baba77…

MALICIOUS

PDF

103.3 KB Created: 2021-06-26 17:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad41a726e3833e9f9712e934ef84dfce SHA-1: d20ce66c4f714bbb043724b28f17131732b442f1 SHA-256: 6ef13ee568baba778ee926e5ca988fb19250c46d0566f405e86b90795d77dcca
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/70k9mh4st4ugtdbnbtpeig5qv8/62304672633.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a9609002---29494192188.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc8767b4e---52372087286.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/g1mr7769ecd27606medj79e7ul/rudogexuvimevu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dd77b07403eaec854b814f15c975eb47/32022241146.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9898792fd6---45299676687.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081354a276f9---88803104387.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a67333e9a---95734967939.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084540580f02---44195908118.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/jazujopel.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d239e626bf---vapipezujavukuvusuf.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/77395522514.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4r4gfj4qla4pkuf5f2eg2h5k7q/30075291711.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83585a3bd---purofemepuzowoduxori.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac6df44a---xisofudupopazakizovus.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/19503941758.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c325460---46757921125.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/dosisesutedezoguketin.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/walatixo.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/66999701674.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/95215455139.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/fesutukexalipo.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/somelaromi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e1a314da---9319306017.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0df27dce---gukar.pdfIn PDF document text
    • http://bwc.lt/i/81297113641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+am+a+man+woman+looking+for+meme+generatorPDF 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_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 10520 bytes
SHA-256: 7613ea3fb5f15bc2676e2b8a4f6337431eaf6bf9d1c07a72ae829812b498c931
font_01_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 17276 bytes
SHA-256: 08f53a6e4d4e3505cdc19067c2d3af6a4cd4ac917308b4a8d2a70feca80f68e0
font_02_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 16368 bytes
SHA-256: e9b2452a1cf16b5e0f6974a05f800d4cc4e6b4f9c089b89fc2251dac04fc0fd2
font_03_sfnt_off00017709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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