Malicious PDF — malware analysis report

Static analysis result for SHA-256 26490a102b2f4879…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 18:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 640d5eebf91c6687b452513a8c3d7eeb SHA-1: 270c80d7eda9e3ad5d7bb301751fc74b1e08fc41 SHA-256: 26490a102b2f48798829631c3fdebd6d013fbb39925579e9f5f19da79bc4cac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zmiz.hr/userfiles/file/nalawo.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/tesowujadekumeponutolikut.pdfIn PDF document text
    • http://www.swiftsecurehosting.com/rsnpromotion/siteuploads/editorimg/file/4307104630.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • http://ahchala.com/img/file/93873461060.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/lunipekatatafe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bd48159mvvpp5t40v8s7n3k8h4/komokolel.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/47905564095.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wuxadobofilolavil.pdfIn PDF document text
    • https://bloc-immo.com/images/72799944130.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/48262f47554f68c03ee7e0f8135e6952/74132015835.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/56373312393.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/98444780643.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/80910316038.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/lupulefozinezaza.pdfIn PDF document text
    • https://ms02bet.net/contents/files/10119397725.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/drkn0b345kfetmc1lesuoa1obo/pirazuwatu.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/bubotovibudelapotu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16239859154447.pdfIn PDF document text
    • http://regmac.net/userfiles/files/22597519617.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2162d2ff92---lizejubevuzijuvugobap.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/55036025404.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071500a883cc---nepaxaripifilofasukisoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=theory+of+human+motivation+pdf+freePDF 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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 16492 bytes
SHA-256: 5606da27c6ca5bb6ea3a62ef62b4714044283c4edeb1722d4b3643e1db4dbd1c
font_01_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10792 bytes
SHA-256: 53b1ff981e11983c8adde69f9fa089861f2610af03ebfeda92d2d77fea0a2cf0
font_02_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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