Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaa409f678d19b4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 23:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6aa3a511bf07834c957a56831350ab9a SHA-1: f232121b54c623ac239245d48ad305a10ad624a0 SHA-256: fbaa409f678d19b4a64068e5ba97951557e64b9c99eb20e892bd94bbc5112664
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://catamma.ru/uplcv?utm_term=4fun+app+apk+download PDF link annotation
    • https://mygenius.ru/admin/ckfinder/userfiles/files/15244322886.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-3/20210903054844622742.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xefinelibegimabadusemawo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378ac9d39a6---8350920535.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/latovam.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d70219cb0---nibebutewadumeboretir.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/tozuvamusoxadisukakefadef.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/kujabosatotipewabo.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/fitanaf.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/71413072616.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/69058156559.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/58509562298.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10486c847---73720422208.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ba5afd0d5073aea912870b27813345f/nudimisidujorefenafof.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe389e3c1e---rikomenaletumifiwesiz.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/47379516221.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ce0885b90aa71a1e9cc8525e2aa97023/fuxini.pdfIn PDF document text
    • http://lj-group.cn/upload/files/68801069260.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/tigesebopewileput.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/83503956277.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/gelaluvefirilagovefebutol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fe52eb83---1048409532.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/zinifijufodamitoronik.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/24627194541.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/22412511038.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kuzibesuwakotu.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10160 bytes
SHA-256: e954770c2603970e4a798131813a83b2a382a6b1bca822c27f04fde267bf950a
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 17240 bytes
SHA-256: 083ec958c6ebb7d12f3d238b57fc9e88b71b845e28e874347389ee24268d2555
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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