Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bab80001ee2df6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd1b003025942e4565748b607fa28cc9 SHA-1: c90725eca96e8be90053c739a77dfc44c60b0e9b SHA-256: 49bab80001ee2df6e1609965af8729839401aac757c6bdfeabcb320c6749fe06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to deceive search engines and users into visiting malicious sites. The embedded JavaScript suggests an attempt to execute further malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dkmmotor.com/files/userfiles/file/63087897185.pdf In PDF document text
    • http://bioident.pl/photos_fck/file/sosurefubamawosod.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nisekevovemetujomolo.pdfIn PDF document text
    • http://quinta.cl/upload/files/11931795576.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/xukavilojasarunikasatapa.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61340693168.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/buzupapibiju.pdfIn PDF document text
    • http://haki.vn/uploads/files/77246377165.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b41c3c23bd---60464255090.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/fewikonedolutidutedipotuv.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/24014978368.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3bc876fa839d1060f650c0817fd86b7c/bazijonig.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160753b555d901---34144818862.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/49305491644.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/19773691637.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/mazoxap.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/notuwonitilo.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/rolexezudot.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/vexuredamaseku.pdfIn PDF document text
    • http://aps-mes.com/files/file/12518327129.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/15388331170.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/pilamuwodadukufolo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/62413696242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wastewater+treatment+plant+operation+maintenance+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 10712 bytes
SHA-256: 7992bf19b7e0274f937f9d7e5385d415f5f6e3abe21862a8597c5df4d5897d2d
font_02_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 15056 bytes
SHA-256: 488a7f73ce4c778d6637c37339c1d0faf0bba0ecf861e2f811b6a25509324c1f

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