Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be162cfeaec44a5…

MALICIOUS

PDF

85.3 KB Created: 2021-08-31 23:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7543504c9fedff17693939b916d9036 SHA-1: 299d4cb06fa47f9e1c1bc18f343ea45811015e6f SHA-256: 9be162cfeaec44a58e5f29515ce9a257a888d6f3b6799758a1be0a80e23a25c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a high likelihood of malicious intent, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=jquery+serialize+form+post PDF link annotation
    • https://tasleemdubai.com/userfiles/files/dixazetusodugemox.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/feu54l66c8j1r721r0505r5h14/fepedelonaxawup.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fubonawomesimozim.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/16790693711.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc480394909---50541269895.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ce9a2a4db---kukurot.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210619090248_2g02ks.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f471191a43---97711073906.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/413426c87b7280109613891f42627821/lutararadudidazu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/jonaxinej.pdfIn PDF document text
    • https://svltv.in/userfiles/files/vugidetuwazivagut.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9830b8bb57---gapulik.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c09ac1d0a393aed901db5ffb020431a0/80889283025.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3a4d8fb1---satuwipixakofamafeloz.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/tujewatevo.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/desotisozi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rj51a6qt76an6kudmgsr8rubqa/jenijenudu.pdfIn PDF document text
    • https://drlanda.hu/user/file/34114183836.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a5b67d1e---78582202445.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///rapuxugalasip.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/55610008596.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/64d4162f35e9cdeecaf2964f0f6d4ab6/7306817698.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/25067897053.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/venotubupijojafidomalove.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d495a0976d---7818996719.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 21372 bytes
SHA-256: da4b37265bace116864cea89e53b1729520e6b82ff9e13cd1d407cfb63f8e3b6
font_02_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 10828 bytes
SHA-256: 484027c37f042594364cbe43721849c441f9c82c89c5a5a1b3b49410ee60b63b

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