Malicious PDF — malware analysis report

Static analysis result for SHA-256 928cc32f53a04078…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 03:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a9b26029c73b41f65b73f2dd8111696 SHA-1: 09e81997f3cc37f2f9abcc038f87874fc9581d5b SHA-256: 928cc32f53a04078da86a568082c59785775834bd88ca6c1c4afd44e06bc31d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially compromised websites or phishing pages. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=education+system+in+japan+pdf PDF link annotation
    • https://discovercefalu.it/_data/images/file/63959108183.pdfIn PDF document text
    • https://khanikango.in/file/sutejoxomefodifomemeg.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/82184136801.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/91189689200.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cd4812885ff2edb1d3718f4e275ca19f/veletivez.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/meletipusatuxi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/760bsmgsu3b2l4nunq9i52pjbu/kufedafuzuzejuziseziz.pdfIn PDF document text
    • http://shimoltd.ru/images/file/14827683554.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/358ec68435ff25f00c07261bfc8bbee5/2617986215.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9eadf8db7e97aa771eb900c36499e806/ponejetokofigojodada.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/pemonefupiwuvojozavurofeb.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b96e1078---fenizevilavapaperi.pdfIn PDF document text
    • https://ivanamihic.com//files/33284690841.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7eed569fa---84035088346.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/66d89a13860ffaf8b5827bb7adaf519c/lerozevuxarowolifafiw.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05b7e7fccc---dijexobinajapopi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771da10c540---53526574293.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/58698163526.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lekoriloxefenotukogasagi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f30ae4f7bf9dd24ba5bd2fba4eef0fee/mukerujubobemudajaluvojot.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16121cf81c9f56---55475226888.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d330ea00c7---31016508778.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609939edce38a---kobigajuwavefarunobi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad87c7dac---rokiviwofudojexi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/959lmb0mo3463jdj8q7fcumod8/wofafinuvesaxapisudun.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17160 bytes
SHA-256: db046ed81d2fc4ee08e4b944f0d9f77dc64e73ab6be14a8d6bac00faf9e2fdd2
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 10964 bytes
SHA-256: ed5a97919fc17e817514c51a6467ac7db4e11831d0e2377479fc7a44ab646f7c

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