Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d40d861e29512ea…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 19:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9610b1e8db2ad4a1783ab6944ea55d0e SHA-1: 9f8592f2a91e8ddf0f5686b05b7fa9b448734f80 SHA-256: 5d40d861e29512ea1ceedc003ed3708f482b73b732393e423e310c62001e082a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress upload directories. The presence of 'utm_term' parameters suggests a phishing or tracking mechanism, aiming to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=hyde+app+hider+apk+download PDF link annotation
    • https://priscar.com/documents/files/84302323596.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/fexisukej.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/eeb0fdcf0f6b848ea7482c7b100a15a1/telelakes.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/romusuxupabogefadu.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/51587595637.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/29695736679.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5c476f82---98467351548.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/ravezogoluwopuvaxo.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/82808900541.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0aebc11f44b243831a0605f57bb874af/wamufiwazirizodi.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/53018993360.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/bijikalupeniluge.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/livewafefo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/2148755926.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/60917078988.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0493b9d676c48eea3f18e2f62493bbce/60804760964.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6bee2c4945f881101e4060d184485b3a/88731548333.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/87112778049.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/84988435468.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpegj6pj5kcvk94on04v0hfg1o/parupuluvir.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/71501458614.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/rokitanasuval.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/94154276763.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/daxonomawuziwefitob.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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 17008 bytes
SHA-256: 9765df9e7c7be00e7f39317a15c1dc6a56c4dcdcd99460bade2fde3d2b4fa419
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 10508 bytes
SHA-256: 220852a6b00bc431f7d3b282800e935bf3e54c2405d0887de3d11248cc9f049a

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