Malicious PDF — malware analysis report

Static analysis result for SHA-256 8571d6f9d32a9fa9…

MALICIOUS

PDF

89.3 KB Created: 2021-07-23 16:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d0bc9892f432af4db8778f0c23694c7 SHA-1: c36c439deef7124e13462a94ca1e5394c3a02e53 SHA-256: 8571d6f9d32a9fa931bec6ed2251fa4330f50f04328459e2d2b9637e108da318
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/jeduvozodiguposakatozuji.pdf In PDF document text
    • https://hansenlight.com/UploadFile/files/sedefakinosa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5cba18d23---ropepojunivokusape.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/23580122169.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6940b697a01395f1357087e7e95b0e84/pepoxub.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/10084385660.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/razavorazejazufuxugetu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/fobinonowigutusavewi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caac2333edafe4fd8666b571c26412ba/topizaxopozul.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a72ad9ece11---66986661443.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l8ustrernchtkkl29pegops127/sukamukepagevawisirorip.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wejaxenusazaxan.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/7724651086.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kk891q27nmpiv40ns25bee7tcj/41998960926.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/16ae0a4d74166e6820d7aa390233c274/62333025246.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/lenebuxijujofudeje.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376de8701---gokanuputagodafuf.pdfIn PDF document text
    • https://egf.tw/test2/images/file/68985118398.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c55063479---wusesivunigogivonudafe.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/23063522520.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077e07dbe034---kipum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=baixar+sony+vegas+64+bits+crackeado+2019PDF 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_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 19736 bytes
SHA-256: d4a8ca13ce9066c785db43815aa4f4f59fc0d3ec329479789731f010b48a78d1
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 11772 bytes
SHA-256: 7eb0a92b8a65bcbbbd5ca9ce893c4c1d6d26f8ff13a845b3bd9f4a972e8367f1
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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